Correctly ignore fields using ObjectTypeExtension

src/HotChocolate/Core/src/Types/Types/Descriptors/ObjectTypeDescriptor.cs

@@ -69,6 +69,19 @@ protected override void OnCreateDefinition(
                 Definition.AttributesAreApplied = true;
             }
 
+            foreach (ObjectFieldDescriptor field in Fields)
+            {
+                if (!field.Definition.Ignore)
+                    continue;
+
+                // if this definition is used for a type extension we need a 
+                // binding to a field which shall be ignored. In case this is a 
+                // definition for the type it will be ignored by the type initialization.
+                Definition.FieldIgnores.Add(new ObjectFieldBinding(
+                    field.Definition.Name,
+                    ObjectFieldBindingType.Field));
+            }
+
             var fields = new Dictionary<NameString, ObjectFieldDefinition>();
             var handledMembers = new HashSet<MemberInfo>();