### 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?)
if (bezier_edit->is_visible()) {
		_cancel_bezier_edit();
	} else {
		int track_count = animation->get_track_count();
		for (int i = 0; i < track_count; ++i) {
			if (animation->track_get_type(i) == Animation::TrackType::TYPE_BEZIER) {
				_bezier_edit(i);
				return;
			}
		}
	}
}
void AnimationTrackEditor::_pan_callback(Vector2 p_scroll_vec, Ref<InputEvent> p_event) {
	Ref<InputEventWithModifiers> iewm = p_event;
	if (iewm.is_valid() && iewm->is_alt_pressed()) {
		if (p_scroll_vec.x < 0 || p_scroll_vec.y < 0) {
			goto_prev_step(true);
		} else {
			goto_next_step(true);
		}
	} else {
		timeline->set_value(timeline->get_value() - p_scroll_vec.x / timeline->get_zoom_scale());
		scroll->set_v_scroll(scroll->get_v_scroll() - p_scroll_vec.y);
	}
}
void AnimationTrackEditor::_zoom_callback(float p_zoom_factor, Vector2 p_origin, Ref<InputEvent> p_event) {