### 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?)
undo_redo->add_do_method(animation.ptr(), "track_set_key_transition", track, key, val);
				undo_redo->add_undo_method(animation.ptr(), "track_set_key_transition", track, key, prev_val);
				update_obj = true;
			}
			EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
			switch (animation->track_get_type(track)) {
				case Animation::TYPE_POSITION_3D:
				case Animation::TYPE_ROTATION_3D:
				case Animation::TYPE_SCALE_3D: {
					Variant old = animation->track_get_key_value(track, key);
					if (!setting) {
						String chan;
						switch (animation->track_get_type(track)) {
							case Animation::TYPE_POSITION_3D:
								chan = "Position3D";
								break;
							case Animation::TYPE_ROTATION_3D:
								chan = "Rotation3D";
								break;
							case Animation::TYPE_SCALE_3D:
								chan = "Scale3D";
								break;
							default: {
							}
						}
						setting = true;
						undo_redo->create_action(vformat(TTR("Animation Multi Change %s"), chan));
					}
					undo_redo->add_do_method(animation.ptr(), "track_set_key_value", track, key, p_value);
					undo_redo->add_undo_method(animation.ptr(), "track_set_key_value", track, key, old);