feature: обработал доступ к приватному свойству

расширил тест

src/Data2DtoConverter.php

@@ -320,12 +320,15 @@ class Data2DtoConverter
 
     private function getValue(object $object, \ReflectionProperty $property)
     {
-        if (!$property->isInitialized($object)) {
+        if (!$property->isPublic()) {
-            return null;
+            $property->setAccessible(true);
         }
 
+        if (!$property->isInitialized($object)) {
             if (!$property->isPublic()) {
-            $property->setAccessible(true);
+                $property->setAccessible(false);
+            }
+            return null;
         }
 
         $value = $property->getValue($object);

tests/unit/Converter/fixtures/FillTest/HelloRequest.php

@@ -18,4 +18,16 @@ class HelloRequest
     public BuyRequest $buy;
     #[DTOMeta(class: Bar::class)]
     public BarInterface $bar;
+
+    private BuyRequest $buy2;
+
+    public function getBuy2(): BuyRequest
+    {
+        return $this->buy2;
+    }
+
+    public function setBuy2(BuyRequest $buy2): void
+    {
+        $this->buy2 = $buy2;
+    }
 }