Good while it lasted, restored full 3D for 2D viewport, as required for Canvas BG mode. Fixes #14540

editor/editor_node.cpp

@@ -5033,7 +5033,7 @@ EditorNode::EditorNode() {
 	scene_root_parent->set_v_size_flags(Control::SIZE_EXPAND_FILL);
 
 	scene_root = memnew(Viewport);
-	scene_root->set_usage(Viewport::USAGE_2D);
+	//scene_root->set_usage(Viewport::USAGE_2D); canvas BG mode prevents usage of this as 2D
 	scene_root->set_disable_3d(true);
 
 	VisualServer::get_singleton()->viewport_set_hide_scenario(scene_root->get_viewport_rid(), true);