### Godot version

4.1.dev (dc625bcbfc5b587ba8867481ee7a1f6a567c25d0)

### System information

Mageia 9, Linux

### Issue description

When importing a project in current `master`, the following error is raised for each asset that gets imported:
```
Attempting to parent and popup a dialog that already has a parent.
```

It seems to be raised once per asset, caused by the progress dialog.

CC @bruvzg

### Steps to reproduce

- Import a new project in Godot that contains importable assets, e.g. https://github.com/RPicster/godot4-demo-desert-light

### Minimal reproduction project

See above.
project_run_bar->stop_playing();
}
void EditorNode::add_io_error(const String &p_error) {
	DEV_ASSERT(Thread::get_caller_id() == Thread::get_main_id());
	singleton->load_errors->add_image(singleton->gui_base->get_theme_icon(SNAME("Error"), SNAME("EditorIcons")));
	singleton->load_errors->add_text(p_error + "\n");
	EditorInterface::get_singleton()->popup_dialog_centered_ratio(singleton->load_error_dialog, 0.5);
}
bool EditorNode::_find_scene_in_use(Node *p_node, const String &p_path) const {
	if (p_node->get_scene_file_path() == p_path) {
		return true;
	}
	for (int i = 0; i < p_node->get_child_count(); i++) {
		if (_find_scene_in_use(p_node->get_child(i), p_path)) {
			return true;
		}
	}
	return false;
}
bool EditorNode::is_scene_in_use(const String &p_path) {
	Node *es = get_edited_scene();
	if (es) {
		return _find_scene_in_use(es, p_path);
	}
	return false;
}
OS::ProcessID EditorNode::has_child_process(OS::ProcessID p_pid) const {
	return project_run_bar->has_child_process(p_pid);
}
void EditorNode::stop_child_process(OS::ProcessID p_pid) {