### Godot version

4.0.dev (c309de53997feff3286295fb2d71657f112a15db)

### System information

Linux, Nvidia, Vulkan

### Issue description

Editor segfaults when certain conditions are met when using the AnimationPlayer editor.

### Steps to reproduce

1. Create multiple animations, saved into a animation collection
2. Open an existing animation, then make a new empty animation
3. Change from seconds to fps, or add a new property to animate ()
4. Editor crashes

NOTE: It is slightly random and I have not found a perfect repro

### Minimal reproduction project

N/A (TBD?)
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 {