### 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.
immediate_dialog_confirmed = true;
}
bool EditorNode::immediate_confirmation_dialog(const String &p_text, const String &p_ok_text, const String &p_cancel_text) {
	ConfirmationDialog *cd = memnew(ConfirmationDialog);
	cd->set_text(p_text);
	cd->set_ok_button_text(p_ok_text);
	cd->set_cancel_button_text(p_cancel_text);
	cd->connect("confirmed", callable_mp(singleton, &EditorNode::_immediate_dialog_confirmed));
	singleton->gui_base->add_child(cd);
	cd->popup_centered();
	while (true) {
		OS::get_singleton()->delay_usec(1);
		DisplayServer::get_singleton()->process_events();
		Main::iteration();
		if (singleton->immediate_dialog_confirmed || !cd->is_visible()) {
			break;
		}
	}
	memdelete(cd);
	return singleton->immediate_dialog_confirmed;
}
void EditorNode::cleanup() {
	_init_callbacks.clear();
}
int EditorNode::get_current_tab() {