### 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.
ERR_MAIN_THREAD_GUARD;
	clamp_to_embedder = p_enable;
}
bool Window::is_clamped_to_embedder() const {
	ERR_READ_THREAD_GUARD_V(false);
	return clamp_to_embedder;
}
void Window::set_unparent_when_invisible(bool p_unparent) {
	unparent_when_invisible = p_unparent;
}
void Window::set_layout_direction(Window::LayoutDirection p_direction) {
	ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_INDEX((int)p_direction, 4);
	layout_dir = p_direction;
	propagate_notification(Control::NOTIFICATION_LAYOUT_DIRECTION_CHANGED);
}
Window::LayoutDirection Window::get_layout_direction() const {
	ERR_READ_THREAD_GUARD_V(LAYOUT_DIRECTION_INHERITED);
	return layout_dir;
}
bool Window::is_layout_rtl() const {
	ERR_READ_THREAD_GUARD_V(false);
	if (layout_dir == LAYOUT_DIRECTION_INHERITED) {
		if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
			return true;
		}
		Node *parent_node = get_parent();
		while (parent_node) {
			Control *parent_control = Object::cast_to<Control>(parent_node);