### Godot version

4.0.rc

### System information

Any

### Issue description

If the RESET animation is generated at the same time as the Bezier track is generated, the bezier edit button will not be active.

![image](https://user-images.githubusercontent.com/61938263/218256176-88b1b196-7b6b-4404-84ad-e8694f23bb1b.png)

Also, if you delete a track in the Bezier Editor, or in undo redo, it will not update correctly.

### Steps to reproduce

![image](https://user-images.githubusercontent.com/61938263/218256230-4b0219d5-87e4-453a-8294-59f8feb0cfd5.png)


### Minimal reproduction project

N/A
animation = p_animation;
	read_only = p_read_only;
	if (animation.is_valid()) {
		len_hb->show();
		if (read_only) {
			add_track->hide();
		} else {
			add_track->show();
		}
		play_position->show();
	} else {
		len_hb->hide();
		add_track->hide();
		play_position->hide();
	}
	queue_redraw();
}
Size2 AnimationTimelineEdit::get_minimum_size() const {