### 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?)
Ref<Font> font = get_theme_font(SNAME("font"), SNAME("Label"));
	int font_size = get_theme_font_size(SNAME("font_size"), SNAME("Label"));
	int separation = get_theme_constant(SNAME("v_separation"), SNAME("ItemList"));
	return Vector2(0, MAX(font->get_height(font_size), icon->get_height()) + separation);
}
void AnimationTrackEditGroup::set_timeline(AnimationTimelineEdit *p_timeline) {
	timeline = p_timeline;
	timeline->connect("zoom_changed", callable_mp(this, &AnimationTrackEditGroup::_zoom_changed));
	timeline->connect("name_limit_changed", callable_mp(this, &AnimationTrackEditGroup::_zoom_changed));
}
void AnimationTrackEditGroup::set_root(Node *p_root) {
	root = p_root;
	queue_redraw();
}
void AnimationTrackEditGroup::_zoom_changed() {
	queue_redraw();
}
AnimationTrackEditGroup::AnimationTrackEditGroup() {
	set_mouse_filter(MOUSE_FILTER_PASS);
}
void AnimationTrackEditor::add_track_edit_plugin(const Ref<AnimationTrackEditPlugin> &p_plugin) {
	if (track_edit_plugins.has(p_plugin)) {
		return;
	}
	track_edit_plugins.push_back(p_plugin);
}
void AnimationTrackEditor::remove_track_edit_plugin(const Ref<AnimationTrackEditPlugin> &p_plugin) {
	track_edit_plugins.erase(p_plugin);
}
void AnimationTrackEditor::set_animation(const Ref<Animation> &p_anim, bool p_read_only) {