### 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
switch (p_what) {
		case NOTIFICATION_THEME_CHANGED: {
			if (animation.is_null()) {
				return;
			}
			ERR_FAIL_INDEX(track, animation->get_track_count());
			type_icon = _get_key_type_icon();
			selected_icon = get_theme_icon(SNAME("KeySelected"), SNAME("EditorIcons"));
		} break;
		case NOTIFICATION_DRAW: {
			if (animation.is_null()) {
				return;
			}
			ERR_FAIL_INDEX(track, animation->get_track_count());
			int limit = timeline->get_name_limit();
			if (track % 2 == 1) {
				
				draw_rect(Rect2(Point2(1 * EDSCALE, 0), get_size() - Size2(1 * EDSCALE, 0)), Color(0.5, 0.5, 0.5, 0.05));
			}
			if (hovered) {
				
				draw_rect(Rect2(Point2(1 * EDSCALE, 0), get_size() - Size2(1 * EDSCALE, 0)), Color(0.5, 0.5, 0.5, 0.1));
			}
			if (has_focus()) {
				Color accent = get_theme_color(SNAME("accent_color"), SNAME("Editor"));
				accent.a *= 0.7;
				
				draw_style_box(get_theme_stylebox(SNAME("Focus"), SNAME("EditorStyles")), Rect2(Point2(1 * EDSCALE, 0), get_size() - Size2(1 * EDSCALE, 0)));
			}