### Tested versions

- Reproducible in: v4.2.stable.arch_linux
- Not Reproducible in: v4.1.3.stable.official [f06b6836a]

### System information

Garuda Linux (2.6.19-2)

### Issue description

A minor issue where UI Icons are not rendering on the Group Editor window, attaching a screenshot for reference:
![Screenshot_604](https://github.com/godotengine/godot/assets/22623256/c366164a-3d9a-4dcf-97a0-199b5a5a7ecc)

The icons were expected for Buttons like Add, Remove, Filter, etc.

### Steps to reproduce

Select any Node and go to the `Node` panel, click `Manage Groups` and the window will open.

### Minimal reproduction project (MRP)

Minor issue, easily reproducible following the above steps.
if (!node) {
		return;
	}
	const String name = group_name->get_text().strip_edges();
	group_name->clear();
	if (node->is_in_group(name)) {
		error->set_text(TTR("Group name already exists."));
		error->popup_centered();
		return;
	}
	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
	undo_redo->create_action(TTR("Add to Group"));
	undo_redo->add_do_method(node, "add_to_group", name, true);
	undo_redo->add_undo_method(node, "remove_from_group", name);
	undo_redo->add_do_method(this, "update_tree");
	undo_redo->add_undo_method(this, "update_tree");
	
	undo_redo->add_do_method(SceneTreeDock::get_singleton()->get_tree_editor(), "update_tree");
	undo_redo->add_undo_method(SceneTreeDock::get_singleton()->get_tree_editor(), "update_tree");
	undo_redo->commit_action();
}
void GroupsEditor::_group_selected() {