diff --git a/src/Symfony/Component/PropertyInfo/Tests/Extractor/PhpDocExtractorTest.php b/src/Symfony/Component/PropertyInfo/Tests/Extractor/PhpDocExtractorTest.php
index c6a02b5f2f3e..b3489d9fb0c1 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Extractor/PhpDocExtractorTest.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Extractor/PhpDocExtractorTest.php
@@ -169,7 +169,7 @@ public function testExtractCollection($property, array $type = null, $shortDescr
     public static function provideCollectionTypes()
     {
         return [
-            ['iteratorCollection', [new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Iterator', true, null, new Type(Type::BUILTIN_TYPE_STRING))], null, null],
+            ['iteratorCollection', [new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Iterator', true, [new Type(Type::BUILTIN_TYPE_STRING), new Type(Type::BUILTIN_TYPE_INT)], new Type(Type::BUILTIN_TYPE_STRING))], null, null],
             ['iteratorCollectionWithKey', [new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Iterator', true, new Type(Type::BUILTIN_TYPE_INT), new Type(Type::BUILTIN_TYPE_STRING))], null, null],
             [
                 'nestedIterators',
@@ -265,6 +265,8 @@ public static function typesWithCustomPrefixesProvider()
             ['i', [new Type(Type::BUILTIN_TYPE_STRING, true), new Type(Type::BUILTIN_TYPE_INT, true)], null, null],
             ['j', [new Type(Type::BUILTIN_TYPE_OBJECT, true, 'DateTime')], null, null],
             ['nullableCollectionOfNonNullableElements', [new Type(Type::BUILTIN_TYPE_ARRAY, true, null, true, new Type(Type::BUILTIN_TYPE_INT), new Type(Type::BUILTIN_TYPE_INT, false))], null, null],
+            ['nonNullableCollectionOfNullableElements', [new Type(Type::BUILTIN_TYPE_ARRAY, false, null, true, new Type(Type::BUILTIN_TYPE_INT), new Type(Type::BUILTIN_TYPE_INT, true))], null, null],
+            ['nullableCollectionOfMultipleNonNullableElementTypes', [new Type(Type::BUILTIN_TYPE_ARRAY, true, null, true, new Type(Type::BUILTIN_TYPE_INT), [new Type(Type::BUILTIN_TYPE_INT), new Type(Type::BUILTIN_TYPE_STRING)])], null, null],
             ['donotexist', null, null, null],
             ['staticGetter', null, null, null],
             ['staticSetter', null, null, null],
diff --git a/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php b/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php
index b7955584d8c3..5f81dd5a6518 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php
@@ -62,6 +62,8 @@ public function testGetProperties()
                 'i',
                 'j',
                 'nullableCollectionOfNonNullableElements',
+                'nonNullableCollectionOfNullableElements',
+                'nullableCollectionOfMultipleNonNullableElementTypes',
                 'emptyVar',
                 'iteratorCollection',
                 'iteratorCollectionWithKey',
@@ -124,6 +126,8 @@ public function testGetPropertiesWithCustomPrefixes()
                 'i',
                 'j',
                 'nullableCollectionOfNonNullableElements',
+                'nonNullableCollectionOfNullableElements',
+                'nullableCollectionOfMultipleNonNullableElementTypes',
                 'emptyVar',
                 'iteratorCollection',
                 'iteratorCollectionWithKey',
@@ -175,6 +179,8 @@ public function testGetPropertiesWithNoPrefixes()
                 'i',
                 'j',
                 'nullableCollectionOfNonNullableElements',
+                'nonNullableCollectionOfNullableElements',
+                'nullableCollectionOfMultipleNonNullableElementTypes',
                 'emptyVar',
                 'iteratorCollection',
                 'iteratorCollectionWithKey',
diff --git a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php
index 8d956a1103fc..2fb3d2e0f807 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Dummy.php
@@ -98,6 +98,16 @@ class Dummy extends ParentDummy
      */
     public $nullableCollectionOfNonNullableElements;
 
+    /**
+     * @var array<null|int>
+     */
+    public $nonNullableCollectionOfNullableElements;
+
+    /**
+     * @var null|array<int|string>
+     */
+    public $nullableCollectionOfMultipleNonNullableElementTypes;
+
     /**
      * @var array
      */
diff --git a/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php b/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php
index 2c858c3bf9f8..44a461498556 100644
--- a/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php
+++ b/src/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php
@@ -115,15 +115,10 @@ private function createType(DocType $type, bool $nullable, string $docType = nul
 
             [$phpType, $class] = $this->getPhpTypeAndClass((string) $fqsen);
 
-            $key = $this->getTypes($type->getKeyType());
-            $value = $this->getTypes($type->getValueType());
+            $keys = $this->getTypes($type->getKeyType());
+            $values = $this->getTypes($type->getValueType());
 
-            // More than 1 type returned means it is a Compound type, which is
-            // not handled by Type, so better use a null value.
-            $key = 1 === \count($key) ? $key[0] : null;
-            $value = 1 === \count($value) ? $value[0] : null;
-
-            return new Type($phpType, $nullable, $class, true, $key, $value);
+            return new Type($phpType, $nullable, $class, true, $keys, $values);
         }
 
         // Cannot guess
@@ -131,27 +126,20 @@ private function createType(DocType $type, bool $nullable, string $docType = nul
             return null;
         }
 
-        if (str_ends_with($docType, '[]')) {
-            $collectionKeyType = new Type(Type::BUILTIN_TYPE_INT);
-            $collectionValueType = $this->createType($type, false, substr($docType, 0, -2));
+        if (str_ends_with($docType, '[]') && $type instanceof Array_) {
+            $collectionKeyTypes = new Type(Type::BUILTIN_TYPE_INT);
+            $collectionValueTypes = $this->getTypes($type->getValueType());
 
-            return new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true, $collectionKeyType, $collectionValueType);
+            return new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true, $collectionKeyTypes, $collectionValueTypes);
         }
 
         if ((str_starts_with($docType, 'list<') || str_starts_with($docType, 'array<')) && $type instanceof Array_) {
             // array<value> is converted to x[] which is handled above
             // so it's only necessary to handle array<key, value> here
-            $collectionKeyType = $this->getTypes($type->getKeyType())[0];
-
+            $collectionKeyTypes = $this->getTypes($type->getKeyType());
             $collectionValueTypes = $this->getTypes($type->getValueType());
-            if (1 != \count($collectionValueTypes)) {
-                // the Type class does not support union types yet, so assume that no type was defined
-                $collectionValueType = null;
-            } else {
-                $collectionValueType = $collectionValueTypes[0];
-            }
 
-            return new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true, $collectionKeyType, $collectionValueType);
+            return new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true, $collectionKeyTypes, $collectionValueTypes);
         }
 
         $docType = $this->normalizeType($docType);