diff --git a/samples/Chart/33_Chart_create_line_dateaxis.php b/samples/Chart/33_Chart_create_line_dateaxis.php
index c177de79a..8f05684e4 100644
--- a/samples/Chart/33_Chart_create_line_dateaxis.php
+++ b/samples/Chart/33_Chart_create_line_dateaxis.php
@@ -335,7 +335,7 @@ $helper->renderChart($chart, __FILE__);
 $spreadsheet->setActiveSheetIndex(1);
 
 // Save Excel 2007 file
-$helper->write($spreadsheet, __FILE__, ['Xlsx'], true);
+$helper->write($spreadsheet, __FILE__, ['Xlsx'], true, resetActiveSheet: false);
 $spreadsheet->disconnectWorksheets();
 
 function dateRange(int $nrows, Spreadsheet $wrkbk): array
diff --git a/samples/Chart/33_Chart_create_scatter5_trendlines.php b/samples/Chart/33_Chart_create_scatter5_trendlines.php
index 7467c8206..2912b7f7c 100644
--- a/samples/Chart/33_Chart_create_scatter5_trendlines.php
+++ b/samples/Chart/33_Chart_create_scatter5_trendlines.php
@@ -270,4 +270,4 @@ $helper->renderChart($chart, __FILE__);
 $spreadsheet->setActiveSheetIndex(1);
 
 // Save Excel 2007 file
-$helper->write($spreadsheet, __FILE__, ['Xlsx'], true);
+$helper->write($spreadsheet, __FILE__, ['Xlsx'], true, resetActiveSheet: false);
diff --git a/samples/Chart/33_Chart_create_scatter6_value_xaxis.php b/samples/Chart/33_Chart_create_scatter6_value_xaxis.php
index 94f602a92..0ec7902e1 100644
--- a/samples/Chart/33_Chart_create_scatter6_value_xaxis.php
+++ b/samples/Chart/33_Chart_create_scatter6_value_xaxis.php
@@ -131,4 +131,4 @@ $helper->renderChart($chart, __FILE__);
 $spreadsheet->setActiveSheetIndex(1);
 
 // Save Excel 2007 file
-$helper->write($spreadsheet, __FILE__, ['Xlsx'], true);
+$helper->write($spreadsheet, __FILE__, ['Xlsx'], true, resetActiveSheet: false);
diff --git a/src/PhpSpreadsheet/Chart/Axis.php b/src/PhpSpreadsheet/Chart/Axis.php
index 5b20e91dd..9b804b2ef 100644
--- a/src/PhpSpreadsheet/Chart/Axis.php
+++ b/src/PhpSpreadsheet/Chart/Axis.php
@@ -49,6 +49,8 @@ class Axis extends Properties
 
     private ?AxisText $axisText = null;
 
+    private ?Title $dispUnitsTitle = null;
+
     /**
      * Axis Options.
      *
@@ -70,6 +72,28 @@ class Axis extends Properties
         'majorTimeUnit' => self::TIME_UNIT_YEARS,
         'minorTimeUnit' => self::TIME_UNIT_MONTHS,
         'baseTimeUnit' => self::TIME_UNIT_DAYS,
+        'logBase' => null,
+        'dispUnitsBuiltIn' => null,
+    ];
+    public const DISP_UNITS_HUNDREDS = 'hundreds';
+    public const DISP_UNITS_THOUSANDS = 'thousands';
+    public const DISP_UNITS_TEN_THOUSANDS = 'tenThousands';
+    public const DISP_UNITS_HUNDRED_THOUSANDS = 'hundredThousands';
+    public const DISP_UNITS_MILLIONS = 'millions';
+    public const DISP_UNITS_TEN_MILLIONS = 'tenMillions';
+    public const DISP_UNITS_HUNDRED_MILLIONS = 'hundredMillions';
+    public const DISP_UNITS_BILLIONS = 'billions';
+    public const DISP_UNITS_TRILLIONS = 'trillions';
+    public const DISP_UNITS_BUILTIN_INT = [
+        100 => self::DISP_UNITS_HUNDREDS,
+        1000 => self::DISP_UNITS_THOUSANDS,
+        10000 => self::DISP_UNITS_TEN_THOUSANDS,
+        100000 => self::DISP_UNITS_HUNDRED_THOUSANDS,
+        1000000 => self::DISP_UNITS_MILLIONS,
+        10000000 => self::DISP_UNITS_TEN_MILLIONS,
+        100000000 => self::DISP_UNITS_HUNDRED_MILLIONS,
+        1000000000 => self::DISP_UNITS_BILLIONS,
+        1000000000000 => self::DISP_UNITS_TRILLIONS,
     ];
 
     /**
@@ -149,7 +173,9 @@ class Axis extends Properties
         ?string $hidden = null,
         ?string $baseTimeUnit = null,
         ?string $majorTimeUnit = null,
-        ?string $minorTimeUnit = null
+        ?string $minorTimeUnit = null,
+        null|float|int|string $logBase = null,
+        ?string $dispUnitsBuiltIn = null
     ): void {
         $this->axisOptions['axis_labels'] = $axisLabels;
         $this->setAxisOption('horizontal_crosses_value', $horizontalCrossesValue);
@@ -166,6 +192,8 @@ class Axis extends Properties
         $this->setAxisOption('baseTimeUnit', $baseTimeUnit);
         $this->setAxisOption('majorTimeUnit', $majorTimeUnit);
         $this->setAxisOption('minorTimeUnit', $minorTimeUnit);
+        $this->setAxisOption('logBase', $logBase);
+        $this->setAxisOption('dispUnitsBuiltIn', $dispUnitsBuiltIn);
     }
 
     /**
@@ -317,6 +345,18 @@ class Axis extends Properties
         return $this->noFill;
     }
 
+    public function setDispUnitsTitle(?Title $dispUnitsTitle): self
+    {
+        $this->dispUnitsTitle = $dispUnitsTitle;
+
+        return $this;
+    }
+
+    public function getDispUnitsTitle(): ?Title
+    {
+        return $this->dispUnitsTitle;
+    }
+
     /**
      * Implement PHP __clone to create a deep clone, not just a shallow copy.
      */
@@ -326,6 +366,7 @@ class Axis extends Properties
         $this->majorGridlines = ($this->majorGridlines === null) ? null : clone $this->majorGridlines;
         $this->majorGridlines = ($this->minorGridlines === null) ? null : clone $this->minorGridlines;
         $this->axisText = ($this->axisText === null) ? null : clone $this->axisText;
+        $this->dispUnitsTitle = ($this->dispUnitsTitle === null) ? null : clone $this->dispUnitsTitle;
         $this->fillColor = clone $this->fillColor;
     }
 }
diff --git a/src/PhpSpreadsheet/Chart/Title.php b/src/PhpSpreadsheet/Chart/Title.php
index e9c42a4c4..3cdc4d1ee 100644
--- a/src/PhpSpreadsheet/Chart/Title.php
+++ b/src/PhpSpreadsheet/Chart/Title.php
@@ -16,7 +16,7 @@ class Title
     /**
      * Title Caption.
      *
-     * @var array|RichText|string
+     * @var null|array|RichText|string may be null
      */
     private $caption = '';
 
@@ -39,7 +39,7 @@ class Title
     /**
      * Create a new Title.
      *
-     * @param array|RichText|string $caption
+     * @param null|array|RichText|string $caption may be null
      * @param bool $overlay
      */
     public function __construct($caption = '', ?Layout $layout = null, $overlay = false)
@@ -52,7 +52,7 @@ class Title
     /**
      * Get caption.
      *
-     * @return array|RichText|string
+     * @return null|array|RichText|string may be null
      */
     public function getCaption()
     {
@@ -68,6 +68,9 @@ class Title
             }
         }
         $caption = $this->caption;
+        if ($caption === null) {
+            return '';
+        }
         if (is_string($caption)) {
             return $caption;
         }
@@ -91,7 +94,7 @@ class Title
     /**
      * Set caption.
      *
-     * @param array|RichText|string $caption
+     * @param null|array|RichText|string $caption may be null
      *
      * @return $this
      */
diff --git a/src/PhpSpreadsheet/Helper/Sample.php b/src/PhpSpreadsheet/Helper/Sample.php
index cb23cf597..2f7d95b06 100644
--- a/src/PhpSpreadsheet/Helper/Sample.php
+++ b/src/PhpSpreadsheet/Helper/Sample.php
@@ -111,13 +111,14 @@ class Sample
     /**
      * Write documents.
      *
-     * @param string $filename
      * @param string[] $writers
      */
-    public function write(Spreadsheet $spreadsheet, $filename, array $writers = ['Xlsx', 'Xls'], bool $withCharts = false, ?callable $writerCallback = null): void
+    public function write(Spreadsheet $spreadsheet, string $filename, array $writers = ['Xlsx', 'Xls'], bool $withCharts = false, ?callable $writerCallback = null, bool $resetActiveSheet = true): void
     {
         // Set active sheet index to the first sheet, so Excel opens this as the first sheet
-        $spreadsheet->setActiveSheetIndex(0);
+        if ($resetActiveSheet) {
+            $spreadsheet->setActiveSheetIndex(0);
+        }
 
         // Write documents
         foreach ($writers as $writerType) {
diff --git a/src/PhpSpreadsheet/Reader/Xlsx/Chart.php b/src/PhpSpreadsheet/Reader/Xlsx/Chart.php
index 32737f01a..c1d0eeb7e 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx/Chart.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx/Chart.php
@@ -494,7 +494,7 @@ class Chart
 
     private function chartTitle(SimpleXMLElement $titleDetails): Title
     {
-        $caption = [];
+        $caption = null;
         $titleLayout = null;
         $titleOverlay = false;
         $titleFormula = null;
@@ -503,6 +503,7 @@ class Chart
             $chartDetail = Xlsx::testSimpleXml($chartDetail);
             switch ($titleDetailKey) {
                 case 'tx':
+                    $caption = [];
                     if (isset($chartDetail->rich)) {
                         $titleDetails = $chartDetail->rich->children($this->aNamespace);
                         foreach ($titleDetails as $titleKey => $titleDetail) {
@@ -1518,6 +1519,13 @@ class Chart
         if (isset($chartDetail->crossBetween)) {
             $whichAxis->setCrossBetween((string) self::getAttributeString($chartDetail->crossBetween, 'val'));
         }
+        if (isset($chartDetail->dispUnits, $chartDetail->dispUnits->builtInUnit)) {
+            $whichAxis->setAxisOption('dispUnitsBuiltIn', (string) self::getAttributeString($chartDetail->dispUnits->builtInUnit, 'val'));
+            if (isset($chartDetail->dispUnits->dispUnitsLbl)) {
+                $whichAxis->setDispUnitsTitle(new Title());
+                // TODO parse title elements
+            }
+        }
         if (isset($chartDetail->majorTickMark)) {
             $whichAxis->setAxisOption('major_tick_mark', (string) self::getAttributeString($chartDetail->majorTickMark, 'val'));
         }
@@ -1533,6 +1541,9 @@ class Chart
         if (isset($chartDetail->crossesAt)) {
             $whichAxis->setAxisOption('horizontal_crosses_value', (string) self::getAttributeString($chartDetail->crossesAt, 'val'));
         }
+        if (isset($chartDetail->scaling->logBase)) {
+            $whichAxis->setAxisOption('logBase', (string) self::getAttributeString($chartDetail->scaling->logBase, 'val'));
+        }
         if (isset($chartDetail->scaling->orientation)) {
             $whichAxis->setAxisOption('orientation', (string) self::getAttributeString($chartDetail->scaling->orientation, 'val'));
         }
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/Chart.php b/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
index a3f27d1b9..e8e6ea2fd 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
@@ -158,38 +158,40 @@ class Chart extends WriterPart
         }
 
         $objWriter->startElement('c:title');
-        $objWriter->startElement('c:tx');
-        $objWriter->startElement('c:rich');
-
-        $objWriter->startElement('a:bodyPr');
-        $objWriter->endElement();
-
-        $objWriter->startElement('a:lstStyle');
-        $objWriter->endElement();
-
-        $objWriter->startElement('a:p');
-        $objWriter->startElement('a:pPr');
-        $objWriter->startElement('a:defRPr');
-        $objWriter->endElement();
-        $objWriter->endElement();
-
         $caption = $title->getCaption();
-        if (is_array($caption)) {
-            $caption = $caption[0] ?? '';
-        }
-        $this->getParentWriter()->getWriterPartstringtable()->writeRichTextForCharts($objWriter, $caption, 'a');
+        if ($caption !== null) {
+            $objWriter->startElement('c:tx');
+            $objWriter->startElement('c:rich');
 
-        $objWriter->endElement();
-        $objWriter->endElement();
-        $objWriter->endElement();
+            $objWriter->startElement('a:bodyPr');
+            $objWriter->endElement(); // a:bodyPr
+
+            $objWriter->startElement('a:lstStyle');
+            $objWriter->endElement(); // a:lstStyle
+
+            $objWriter->startElement('a:p');
+            $objWriter->startElement('a:pPr');
+            $objWriter->startElement('a:defRPr');
+            $objWriter->endElement(); // a:defRPr
+            $objWriter->endElement(); // a:pPr
+
+            if (is_array($caption)) {
+                $caption = $caption[0] ?? '';
+            }
+            $this->getParentWriter()->getWriterPartstringtable()->writeRichTextForCharts($objWriter, $caption, 'a');
+
+            $objWriter->endElement(); // a:p
+            $objWriter->endElement(); // c:rich
+            $objWriter->endElement(); // c:tx
+        }
 
         $this->writeLayout($objWriter, $title->getLayout());
 
         $objWriter->startElement('c:overlay');
         $objWriter->writeAttribute('val', ($title->getOverlay()) ? '1' : '0');
-        $objWriter->endElement();
+        $objWriter->endElement(); // c:overlay
 
-        $objWriter->endElement();
+        $objWriter->endElement(); // c:title
     }
 
     /**
@@ -587,6 +589,14 @@ class Chart extends WriterPart
         }
 
         $objWriter->startElement('c:scaling');
+        if (is_numeric($yAxis->getAxisOptionsProperty('logBase'))) {
+            $logBase = $yAxis->getAxisOptionsProperty('logBase') + 0;
+            if ($logBase >= 2 && $logBase <= 1000) {
+                $objWriter->startElement('c:logBase');
+                $objWriter->writeAttribute('val', (string) $logBase);
+                $objWriter->endElement();
+            }
+        }
         if ($yAxis->getAxisOptionsProperty('maximum') !== null) {
             $objWriter->startElement('c:max');
             $objWriter->writeAttribute('val', $yAxis->getAxisOptionsProperty('maximum'));
@@ -632,35 +642,37 @@ class Chart extends WriterPart
 
         if ($xAxisLabel !== null) {
             $objWriter->startElement('c:title');
-            $objWriter->startElement('c:tx');
-            $objWriter->startElement('c:rich');
-
-            $objWriter->startElement('a:bodyPr');
-            $objWriter->endElement();
-
-            $objWriter->startElement('a:lstStyle');
-            $objWriter->endElement();
-
-            $objWriter->startElement('a:p');
-
             $caption = $xAxisLabel->getCaption();
-            if (is_array($caption)) {
-                $caption = $caption[0];
-            }
-            $this->getParentWriter()->getWriterPartstringtable()->writeRichTextForCharts($objWriter, $caption, 'a');
+            if ($caption !== null) {
+                $objWriter->startElement('c:tx');
+                $objWriter->startElement('c:rich');
 
-            $objWriter->endElement();
-            $objWriter->endElement();
-            $objWriter->endElement();
+                $objWriter->startElement('a:bodyPr');
+                $objWriter->endElement(); // a:bodyPr
+
+                $objWriter->startElement('a:lstStyle');
+                $objWriter->endElement(); // a::lstStyle
+
+                $objWriter->startElement('a:p');
+
+                if (is_array($caption)) {
+                    $caption = $caption[0];
+                }
+                $this->getParentWriter()->getWriterPartstringtable()->writeRichTextForCharts($objWriter, $caption, 'a');
+
+                $objWriter->endElement(); // a:p
+                $objWriter->endElement(); // c:rich
+                $objWriter->endElement(); // c:tx
+            }
 
             $layout = $xAxisLabel->getLayout();
             $this->writeLayout($objWriter, $layout);
 
             $objWriter->startElement('c:overlay');
             $objWriter->writeAttribute('val', '0');
-            $objWriter->endElement();
+            $objWriter->endElement(); // c:overlay
 
-            $objWriter->endElement();
+            $objWriter->endElement(); // c:title
         }
 
         $objWriter->startElement('c:numFmt');
@@ -796,6 +808,14 @@ class Chart extends WriterPart
         }
 
         $objWriter->startElement('c:scaling');
+        if (is_numeric($xAxis->getAxisOptionsProperty('logBase'))) {
+            $logBase = $xAxis->getAxisOptionsProperty('logBase') + 0;
+            if ($logBase >= 2 && $logBase <= 1000) {
+                $objWriter->startElement('c:logBase');
+                $objWriter->writeAttribute('val', (string) $logBase);
+                $objWriter->endElement();
+            }
+        }
 
         if ($xAxis->getAxisOptionsProperty('maximum') !== null) {
             $objWriter->startElement('c:max');
@@ -845,26 +865,28 @@ class Chart extends WriterPart
 
         if ($yAxisLabel !== null) {
             $objWriter->startElement('c:title');
-            $objWriter->startElement('c:tx');
-            $objWriter->startElement('c:rich');
-
-            $objWriter->startElement('a:bodyPr');
-            $objWriter->endElement();
-
-            $objWriter->startElement('a:lstStyle');
-            $objWriter->endElement();
-
-            $objWriter->startElement('a:p');
-
             $caption = $yAxisLabel->getCaption();
-            if (is_array($caption)) {
-                $caption = $caption[0];
-            }
-            $this->getParentWriter()->getWriterPartstringtable()->writeRichTextForCharts($objWriter, $caption, 'a');
+            if ($caption !== null) {
+                $objWriter->startElement('c:tx');
+                $objWriter->startElement('c:rich');
 
-            $objWriter->endElement();
-            $objWriter->endElement();
-            $objWriter->endElement();
+                $objWriter->startElement('a:bodyPr');
+                $objWriter->endElement(); // a:bodyPr
+
+                $objWriter->startElement('a:lstStyle');
+                $objWriter->endElement(); // a:lstStyle
+
+                $objWriter->startElement('a:p');
+
+                if (is_array($caption)) {
+                    $caption = $caption[0];
+                }
+                $this->getParentWriter()->getWriterPartstringtable()->writeRichTextForCharts($objWriter, $caption, 'a');
+
+                $objWriter->endElement(); // a:p
+                $objWriter->endElement(); // c:rich
+                $objWriter->endElement(); // c:tx
+            }
 
             if ($groupType !== DataSeries::TYPE_BUBBLECHART) {
                 $layout = $yAxisLabel->getLayout();
@@ -873,9 +895,9 @@ class Chart extends WriterPart
 
             $objWriter->startElement('c:overlay');
             $objWriter->writeAttribute('val', '0');
-            $objWriter->endElement();
+            $objWriter->endElement(); // c:overlay
 
-            $objWriter->endElement();
+            $objWriter->endElement(); // c:title
         }
 
         $objWriter->startElement('c:numFmt');
@@ -950,6 +972,22 @@ class Chart extends WriterPart
                 $objWriter->endElement();
             }
 
+            if ($xAxis->getAxisType() === Axis::AXIS_TYPE_VALUE) {
+                $dispUnits = $xAxis->getAxisOptionsProperty('dispUnitsBuiltIn');
+                $dispUnits = is_numeric($dispUnits) ? (Axis::DISP_UNITS_BUILTIN_INT[(int) $dispUnits] ?? '') : $dispUnits;
+                if (in_array($dispUnits, Axis::DISP_UNITS_BUILTIN_INT, true)) {
+                    $objWriter->startElement('c:dispUnits');
+                    $objWriter->startElement('c:builtInUnit');
+                    $objWriter->writeAttribute('val', $dispUnits);
+                    $objWriter->endElement(); // c:builtInUnit
+                    if ($xAxis->getDispUnitsTitle() !== null) {
+                        // TODO output title elements
+                        $objWriter->writeElement('c:dispUnitsLbl');
+                    }
+                    $objWriter->endElement(); // c:dispUnits
+                }
+            }
+
             if ($xAxis->getAxisOptionsProperty('major_unit') !== null) {
                 $objWriter->startElement('c:majorUnit');
                 $objWriter->writeAttribute('val', $xAxis->getAxisOptionsProperty('major_unit'));
diff --git a/tests/PhpSpreadsheetTests/Chart/Issue3833Test.php b/tests/PhpSpreadsheetTests/Chart/Issue3833Test.php
new file mode 100644
index 000000000..669e23306
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Chart/Issue3833Test.php
@@ -0,0 +1,142 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Chart;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx as XlsxReader;
+use PhpOffice\PhpSpreadsheet\Writer\Xlsx as XlsxWriter;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class Issue3833Test extends AbstractFunctional
+{
+    // based on 33_Char_create_scatter2
+    public function readCharts(XlsxReader $reader): void
+    {
+        $reader->setIncludeCharts(true);
+    }
+
+    public function writeCharts(XlsxWriter $writer): void
+    {
+        $writer->setIncludeCharts(true);
+    }
+
+    public function testDisplayUnits1(): void
+    {
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load('tests/data/Reader/XLSX/issue.3833.units.xlsx');
+
+        /** @var callable */
+        $callableReader = [$this, 'readCharts'];
+        /** @var callable */
+        $callableWriter = [$this, 'writeCharts'];
+        $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xlsx', $callableReader, $callableWriter);
+        $spreadsheet->disconnectWorksheets();
+
+        $sheet = $reloadedSpreadsheet->getSheetByNameOrThrow('charts');
+        $charts2 = $sheet->getChartCollection();
+        self::assertCount(1, $charts2);
+        $chart2 = $charts2[0];
+        self::assertNotNull($chart2);
+        $yAxis = $chart2->getChartAxisY();
+        $dispUnits = $yAxis->getAxisOptionsProperty('dispUnitsBuiltIn');
+        self::assertSame('tenThousands', $dispUnits);
+        $logBase = $yAxis->getAxisOptionsProperty('logBase');
+        self::assertNull($logBase);
+
+        $reloadedSpreadsheet->disconnectWorksheets();
+    }
+
+    public function testDisplayUnits2(): void
+    {
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load('tests/data/Reader/XLSX/issue.3833.units.xlsx');
+        $sheet1 = $spreadsheet->getSheetByNameOrThrow('charts');
+        $charts1 = $sheet1->getChartCollection();
+        self::assertCount(1, $charts1);
+        $chart1 = $charts1[0];
+        self::assertNotNull($chart1);
+        $yAxis1 = $chart1->getChartAxisY();
+        $yAxis1->setAxisOption('dispUnitsBuiltIn', 1000);
+
+        /** @var callable */
+        $callableReader = [$this, 'readCharts'];
+        /** @var callable */
+        $callableWriter = [$this, 'writeCharts'];
+        $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xlsx', $callableReader, $callableWriter);
+        $spreadsheet->disconnectWorksheets();
+
+        $sheet = $reloadedSpreadsheet->getSheetByNameOrThrow('charts');
+        $charts2 = $sheet->getChartCollection();
+        self::assertCount(1, $charts2);
+        $chart2 = $charts2[0];
+        self::assertNotNull($chart2);
+        $yAxis = $chart2->getChartAxisY();
+        $dispUnits = $yAxis->getAxisOptionsProperty('dispUnitsBuiltIn');
+        self::assertSame('thousands', $dispUnits);
+        $logBase = $yAxis->getAxisOptionsProperty('logBase');
+        self::assertNull($logBase);
+
+        $reloadedSpreadsheet->disconnectWorksheets();
+    }
+
+    public function testDisplayUnits3(): void
+    {
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load('tests/data/Reader/XLSX/issue.3833.units.xlsx');
+        $sheet1 = $spreadsheet->getSheetByNameOrThrow('charts');
+        $charts1 = $sheet1->getChartCollection();
+        self::assertCount(1, $charts1);
+        $chart1 = $charts1[0];
+        self::assertNotNull($chart1);
+        $yAxis1 = $chart1->getChartAxisY();
+        $yAxis1->setDispUnitsTitle(null);
+
+        /** @var callable */
+        $callableReader = [$this, 'readCharts'];
+        /** @var callable */
+        $callableWriter = [$this, 'writeCharts'];
+        $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xlsx', $callableReader, $callableWriter);
+        $spreadsheet->disconnectWorksheets();
+
+        $sheet = $reloadedSpreadsheet->getSheetByNameOrThrow('charts');
+        $charts2 = $sheet->getChartCollection();
+        self::assertCount(1, $charts2);
+        $chart2 = $charts2[0];
+        self::assertNotNull($chart2);
+        $yAxis = $chart2->getChartAxisY();
+        self::assertNull($yAxis->getDispUnitsTitle());
+
+        $reloadedSpreadsheet->disconnectWorksheets();
+    }
+
+    public function testLogBase(): void
+    {
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load('tests/data/Reader/XLSX/issue.3833.logarithm.xlsx');
+
+        /** @var callable */
+        $callableReader = [$this, 'readCharts'];
+        /** @var callable */
+        $callableWriter = [$this, 'writeCharts'];
+        $reloadedSpreadsheet = $this->writeAndReload($spreadsheet, 'Xlsx', $callableReader, $callableWriter);
+        $spreadsheet->disconnectWorksheets();
+
+        $sheet = $reloadedSpreadsheet->getSheetByNameOrThrow('charts');
+        $charts2 = $sheet->getChartCollection();
+        self::assertCount(1, $charts2);
+        $chart2 = $charts2[0];
+        self::assertNotNull($chart2);
+        $yAxis = $chart2->getChartAxisY();
+        $logBase = $yAxis->getAxisOptionsProperty('logBase');
+        self::assertSame('10', $logBase);
+        $dispUnits = $yAxis->getAxisOptionsProperty('dispUnitsBuiltIn');
+        self::assertNull($dispUnits);
+
+        $reloadedSpreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/data/Reader/XLSX/issue.3833.logarithm.xlsx b/tests/data/Reader/XLSX/issue.3833.logarithm.xlsx
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diff --git a/tests/data/Reader/XLSX/issue.3833.units.xlsx b/tests/data/Reader/XLSX/issue.3833.units.xlsx
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index 000000000..649fa8086
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