### 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?)
for (int j = 0; j < track_edit_plugins.size(); j++) {
				track_edit = track_edit_plugins.write[j]->create_audio_track_edit();
				if (track_edit) {
					break;
				}
			}
		}
		if (animation->track_get_type(i) == Animation::TYPE_ANIMATION) {
			NodePath path = animation->track_get_path(i);
			Node *node = nullptr;
			if (root && root->has_node(path)) {
				node = root->get_node(path);
			}
			if (node && Object::cast_to<AnimationPlayer>(node)) {
				for (int j = 0; j < track_edit_plugins.size(); j++) {
					track_edit = track_edit_plugins.write[j]->create_animation_track_edit(node);
					if (track_edit) {
						break;
					}
				}
			}
		}
		if (track_edit == nullptr) {
			
			track_edit = memnew(AnimationTrackEdit);
		}
		track_edits.push_back(track_edit);
		if (use_grouping) {
			String base_path = animation->track_get_path(i);
			base_path = base_path.get_slice(":", 0);