### 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
if (in_group) {
				draw_line(Vector2(timeline->get_name_limit(), get_size().height), get_size(), linecolor, Math::round(EDSCALE));
			} else {
				draw_line(Vector2(0, get_size().height), get_size(), linecolor, Math::round(EDSCALE));
			}
			if (dropping_at != 0) {
				Color drop_color = get_theme_color(SNAME("accent_color"), SNAME("Editor"));
				if (dropping_at < 0) {
					draw_line(Vector2(0, 0), Vector2(get_size().width, 0), drop_color, Math::round(EDSCALE));
				} else {
					draw_line(Vector2(0, get_size().height), get_size(), drop_color, Math::round(EDSCALE));
				}
			}
		} break;
		case NOTIFICATION_MOUSE_ENTER:
			hovered = true;
			queue_redraw();
			break;
		case NOTIFICATION_MOUSE_EXIT:
			hovered = false;
			
			hovering_key_idx = -1;
			queue_redraw();
			[[fallthrough]];
		case NOTIFICATION_DRAG_END: {
			cancel_drop();
		} break;
	}
}
int AnimationTrackEdit::get_key_height() const {