### 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?)
return animation;
}
void AnimationTrackEditor::_root_removed() {
	root = nullptr;
}
void AnimationTrackEditor::set_root(Node *p_root) {
	if (root) {
		root->disconnect("tree_exiting", callable_mp(this, &AnimationTrackEditor::_root_removed));
	}
	root = p_root;
	if (root) {
		root->connect("tree_exiting", callable_mp(this, &AnimationTrackEditor::_root_removed), CONNECT_ONE_SHOT);
	}
	_update_tracks();
}
Node *AnimationTrackEditor::get_root() const {