Perform a name check when loading scenes and running on editor, fixes #6152

(cherry picked from commit 200c6cf630)

scene/resources/packed_scene.cpp

@@ -31,6 +31,7 @@
 #include "packed_scene.h"
 
 #include "core/core_string_names.h"
+#include "engine.h"
 #include "io/resource_loader.h"
 #include "project_settings.h"
 #include "scene/2d/node_2d.h"
@@ -276,10 +277,15 @@ Node *SceneState::instance(GenEditState p_edit_state) const {
 						//and the node has nowhere to go anymore
 						stray_instances.push_back(node); //can't be added, go to stray list
 					}
+				} else {
+					if (Engine::get_singleton()->is_editor_hint()) {
+						//validate name if using editor, to avoid broken
+						node->set_name(snames[n.name]);
 					} else {
 						node->_set_name_nocheck(snames[n.name]);
 					}
 				}
+			}
 
 			if (n.owner >= 0) {