diff --git a/rules-tests/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector/Fixture/skip_as_assign_op.php.inc b/rules-tests/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector/Fixture/skip_as_assign_op.php.inc
new file mode 100644
index 00000000000..882e6488a02
--- /dev/null
+++ b/rules-tests/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector/Fixture/skip_as_assign_op.php.inc
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Php85\Rector\ArrayDimFetch\ArrayFirstLastRector\Fixture;
+
+final class SkipAsAssignOp
+{
+    public function run($result, $lastInsertedId)
+    {
+        $result[\array_key_first($result)]  += $lastInsertedId;
+    }
+}
diff --git a/rules-tests/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector/Fixture/skip_as_assign_variable.inc b/rules-tests/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector/Fixture/skip_as_assign_variable.inc
new file mode 100644
index 00000000000..7b88e62cce0
--- /dev/null
+++ b/rules-tests/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector/Fixture/skip_as_assign_variable.inc
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Php85\Rector\ArrayDimFetch\ArrayFirstLastRector\Fixture;
+
+final class SkipAsAssignVariable
+{
+    public function asAssign($result, $lastInsertedId)
+    {
+        $result[\array_key_first($result)]  = $lastInsertedId;
+    }
+}
diff --git a/rules/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector.php b/rules/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector.php
index 57f655e5bd2..067d5463399 100644
--- a/rules/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector.php
+++ b/rules/Php85/Rector/ArrayDimFetch/ArrayFirstLastRector.php
@@ -180,6 +180,14 @@ private function shouldSkip(ArrayDimFetch $arrayDimFetch, Node $scopeNode): bool
             return true;
         }
 
+        if ($arrayDimFetch->getAttribute(AttributeKey::IS_BEING_ASSIGNED) === true) {
+            return true;
+        }
+
+        if ($arrayDimFetch->getAttribute(AttributeKey::IS_ASSIGN_OP_VAR) === true) {
+            return true;
+        }
+
         return (bool) $arrayDimFetch->getAttribute(AttributeKey::IS_UNSET_VAR);
     }
 }