diff --git a/src/Mapper/Proxy/Hydrator/ClosureHydrator.php b/src/Mapper/Proxy/Hydrator/ClosureHydrator.php
index cb0a3cf0..20054c39 100644
--- a/src/Mapper/Proxy/Hydrator/ClosureHydrator.php
+++ b/src/Mapper/Proxy/Hydrator/ClosureHydrator.php
@@ -109,9 +109,12 @@ private function setRelationProperties(array $properties, RelationMap $relMap, o
                             ? $prop->getType()->getTypes()
                             : [$prop->getType()];
 
+                        $relation = $relMap->getRelations()[$property];
                         foreach ($types as $type) {
                             $c = $type->getName();
-                            if ($c === 'object' || $value instanceof $c) {
+                            if ($c === 'object' || $c === 'mixed' || $value instanceof $c) {
+                                $value = $relation->collect($relation->resolve($value, false)) ?? $value;
+
                                 $object->{$property} = $value;
                                 unset($data[$property]);
 
@@ -119,11 +122,7 @@ private function setRelationProperties(array $properties, RelationMap $relMap, o
                                 continue 2;
                             }
                         }
-
-                        $relation = $relMap->getRelations()[$property] ?? null;
-                        if ($relation !== null) {
-                            $value = $relation->collect($relation->resolve($value, true));
-                        }
+                        $value = $relation->collect($relation->resolve($value, true));
                     }
                 }
 
diff --git a/src/Mapper/Proxy/ProxyEntityFactory.php b/src/Mapper/Proxy/ProxyEntityFactory.php
index 0aaf78ca..46ab592b 100644
--- a/src/Mapper/Proxy/ProxyEntityFactory.php
+++ b/src/Mapper/Proxy/ProxyEntityFactory.php
@@ -50,7 +50,7 @@ public function create(
     ): object {
         $class = \array_key_exists($sourceClass, $this->classMap)
             ? $this->classMap[$sourceClass]
-            : $this->defineClass($relMap, $sourceClass);
+            : $this->defineClass($sourceClass);
 
         $proxy = $this->instantiator->instantiate($class);
         $proxy->__cycle_orm_rel_map = $relMap;
@@ -137,7 +137,7 @@ private function entityToArray(object $entity): array
         return $result;
     }
 
-    private function defineClass(RelationMap $relMap, string $class): string
+    private function defineClass(string $class): string
     {
         if (!class_exists($class, true)) {
             throw new \RuntimeException(sprintf(
diff --git a/tests/ORM/Functional/Driver/Common/Mapper/ProxyEntityMapper/EntityWithRelationHydrationTest.php b/tests/ORM/Functional/Driver/Common/Mapper/ProxyEntityMapper/EntityWithRelationHydrationTest.php
index 60b36155..1da5d214 100644
--- a/tests/ORM/Functional/Driver/Common/Mapper/ProxyEntityMapper/EntityWithRelationHydrationTest.php
+++ b/tests/ORM/Functional/Driver/Common/Mapper/ProxyEntityMapper/EntityWithRelationHydrationTest.php
@@ -24,7 +24,7 @@ public function setUp(): void
     {
         parent::setUp();
 
-        $this->makeTable('user', ['id' => 'primary', 'email' => 'string']);
+        $this->makeTable('user', ['id' => 'primary', 'email' => 'string', 'friend_id' => 'integer,nullable']);
         $this->makeTable('profile', ['id' => 'primary', 'name' => 'string', 'user_id' => 'integer']);
         $this->makeTable('tag', ['id' => 'primary', 'name' => 'string',]);
         $this->makeTable('tag_user', ['user_id' => 'integer', 'tag_id' => 'integer',]);
@@ -210,10 +210,38 @@ public function setUp(): void
                     ],
                 ],
             ],
+            EntityWithMixedTypeRelation::class => [
+                Schema::ROLE => 'mixed_type',
+                Schema::MAPPER => Mapper::class,
+                Schema::DATABASE => 'default',
+                Schema::TABLE => 'user',
+                Schema::PRIMARY_KEY => 'id',
+                Schema::COLUMNS => [
+                    'id' => 'id',
+                    'email' => 'email',
+                    'friend_id' => 'friend_id',
+                ],
+                Schema::TYPECAST => ['id' => 'int', 'friend_id' => 'int'],
+                Schema::SCHEMA => [],
+                Schema::RELATIONS => [
+                    'friend' => [
+                        Relation::TYPE => Relation::BELONGS_TO,
+                        Relation::TARGET => EntityWithMixedTypeRelation::class,
+                        Relation::LOAD => Relation::LOAD_PROMISE,
+
+                        Relation::SCHEMA => [
+                            Relation::NULLABLE => false,
+                            Relation::CASCADE => true,
+                            Relation::OUTER_KEY => 'id',
+                            Relation::INNER_KEY => 'friend_id',
+                        ],
+                    ],
+                ],
+            ],
         ]));
     }
 
-    public function testPrivateBelongsToRelationPropertyWithoutProxyShouldBeFilled()
+    public function testPrivateBelongsToRelationPropertyWithoutProxyShouldBeFilled(): void
     {
         $profile = new EntityWithRelationHydrationProfile('test');
         $profile->user_id = 1;
@@ -224,7 +252,30 @@ public function testPrivateBelongsToRelationPropertyWithoutProxyShouldBeFilled()
         // $this->assertInstanceOf(ReferenceInterface::class, $profile->getRefersUser());
     }
 
-    public function testPrivateHasManyRelationPropertyWithoutProxyShouldBeFilled()
+    public function testRelationWithMixedTypeShouldBeFilledAsReference(): void
+    {
+        $user = new EntityWithMixedTypeRelation();
+        $user->email = 'foo@bar.com';
+        $user->friend_id = 1;
+
+        $this->save($user);
+
+        $this->assertInstanceOf(ReferenceInterface::class, $user->friend);
+    }
+
+    public function testRelationExistedInHeapMustFilledAsEntity(): void
+    {
+        $user = new EntityWithMixedTypeRelation();
+        $user->email = 'foo@bar.com';
+        $user->friend_id = 1;
+
+        $this->orm->getRepository(EntityWithMixedTypeRelation::class)->findByPK(1);
+
+        $this->save($user);
+        $this->assertInstanceOf(EntityWithMixedTypeRelation::class, $user->friend);
+    }
+
+    public function testPrivateHasManyRelationPropertyWithoutProxyShouldBeFilled(): void
     {
         $profile = new EntityWithRelationHydrationProfile('test');
         $user = new EntityWithRelationHydrationUser('admin@site.com');
@@ -235,7 +286,7 @@ public function testPrivateHasManyRelationPropertyWithoutProxyShouldBeFilled()
         $this->assertSame($user, $profile->getUser());
     }
 
-    public function testPrivateManyToManyRelationPropertyWithoutProxyShouldBeFilled()
+    public function testPrivateManyToManyRelationPropertyWithoutProxyShouldBeFilled(): void
     {
         $tagContext = new EntityWithRelationHydrationTagContext();
         $tagContext->user_id = 1;
@@ -250,7 +301,7 @@ public function testPrivateManyToManyRelationPropertyWithoutProxyShouldBeFilled(
     /**
      * TODO: error with shadow belongs to
      */
-    public function testPrivatMorphBelongsToRelationPropertyWithoutProxyShouldBeFilled()
+    public function testPrivateMorphBelongsToRelationPropertyWithoutProxyShouldBeFilled(): void
     {
         $profile = new EntityWithRelationHydrationProfile('test');
         $profile->user_id = 1;
@@ -307,7 +358,7 @@ public function testChangeLazyOverloadedArray(): void
         $this->assertContains('test-value', $user->profiles);
     }
 
-    public function testGetLinkValueFromLazyOverloadedRelation()
+    public function testGetLinkValueFromLazyOverloadedRelation(): void
     {
         $user = (new Select($this->orm, EntityWithRelationHydrationUser::class))
             ->fetchOne();
@@ -433,3 +484,11 @@ public function setParent($parent): void
         $this->parent = $parent;
     }
 }
+
+class EntityWithMixedTypeRelation
+{
+    public int $id;
+    public string $email;
+    public ?int $friend_id = null;
+    public mixed $friend;
+}