diff --git a/CHANGELOG b/CHANGELOG
index 44ef08c23..f7b3040ce 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,6 @@
 # 3.21.0 (2025-XX-XX)
 
+ * Fix wrong array index
  * Deprecate `Template::loadTemplate()`
  * Fix testing and expression when it evaluates to an instance of `Markup`
  * Add `ReturnPrimitiveTypeInterface` (and sub-interfaces for number, boolean, string, and array)
diff --git a/src/Node/Expression/ArrayExpression.php b/src/Node/Expression/ArrayExpression.php
index 9678be26c..b6f8a6ba4 100644
--- a/src/Node/Expression/ArrayExpression.php
+++ b/src/Node/Expression/ArrayExpression.php
@@ -78,33 +78,32 @@ class ArrayExpression extends AbstractExpression implements SupportDefinedTestIn
         }
 
         $compiler->raw('[');
-        $first = true;
-        $nextIndex = 0;
-        foreach ($this->getKeyValuePairs() as $pair) {
-            if (!$first) {
+        $isSequence = true;
+        foreach ($this->getKeyValuePairs() as $i => $pair) {
+            if (0 !== $i) {
                 $compiler->raw(', ');
             }
-            $first = false;
 
             $key = null;
             if ($pair['key'] instanceof ContextVariable) {
                 $pair['key'] = new StringCastUnary($pair['key'], $pair['key']->getTemplateLine());
-            }
-            if ($pair['key'] instanceof TempNameExpression) {
+            } elseif ($pair['key'] instanceof TempNameExpression) {
                 $key = $pair['key']->getAttribute('name');
                 $pair['key'] = new ConstantExpression($key, $pair['key']->getTemplateLine());
-            }
-            if ($pair['key'] instanceof ConstantExpression) {
+            } elseif ($pair['key'] instanceof ConstantExpression) {
                 $key = $pair['key']->getAttribute('value');
             }
 
-            if ($nextIndex !== $key && !$pair['value'] instanceof SpreadUnary) {
+            if ($key !== $i) {
+                $isSequence = false;
+            }
+
+            if (!$isSequence && !$pair['value'] instanceof SpreadUnary) {
                 $compiler
                     ->subcompile($pair['key'])
                     ->raw(' => ')
                 ;
             }
-            ++$nextIndex;
 
             $compiler->subcompile($pair['value']);
         }
diff --git a/tests/Fixtures/expressions/array.test b/tests/Fixtures/expressions/array.test
index ac1c8ca0e..72efbf9ee 100644
--- a/tests/Fixtures/expressions/array.test
+++ b/tests/Fixtures/expressions/array.test
@@ -55,6 +55,9 @@ Twig supports array notation
 {% set trad = {194:'ABC',141:'DEF',100:'GHI',170:'JKL',110:'MNO',111:'PQR'} %}
 {% set trad2 = {'194':'ABC','141':'DEF','100':'GHI','170':'JKL','110':'MNO','111':'PQR'} %}
 {{ trad == trad2 ? 'OK' : 'KO' }}
+{% set trad = {11: 'ABC', 2: 'DEF', 4: 'GHI', 3: 'JKL'} %}
+{% set trad2 = {'11': 'ABC', '2': 'DEF', '4': 'GHI', '3': 'JKL'} %}
+{{ trad == trad2 ? 'OK' : 'KO' }}
 
 {# indexes are kept #}
 {{ { 1: "first", 0: "second" } == { '1': "first", '0': "second" } ? 'OK' : 'KO' }}
@@ -104,6 +107,7 @@ ok
 ok
 ok
 
+OK
 OK
 
 OK
@@ -151,6 +155,7 @@ ok
 ok
 ok
 
+OK
 OK
 
 OK