### 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 (!setting) {
						if (mergeable) {
							undo_redo->create_action(TTR("Animation Multi Change Call"), UndoRedo::MERGE_ENDS);
						} else {
							undo_redo->create_action(TTR("Animation Multi Change Call"));
						}
						setting = true;
					}
					undo_redo->add_do_method(animation.ptr(), "track_set_key_value", track, key, d_new);
					undo_redo->add_undo_method(animation.ptr(), "track_set_key_value", track, key, d_old);
					update_obj = true;
				} break;
				case Animation::TYPE_BEZIER: {
					if (name == "value") {
						const Variant &value = p_value;
						if (!setting) {
							setting = true;
							undo_redo->create_action(TTR("Animation Multi Change Keyframe Value"), UndoRedo::MERGE_ENDS);
						}
						float prev = animation->bezier_track_get_key_value(track, key);
						undo_redo->add_do_method(animation.ptr(), "bezier_track_set_key_value", track, key, value);
						undo_redo->add_undo_method(animation.ptr(), "bezier_track_set_key_value", track, key, prev);
						update_obj = true;
					} else if (name == "in_handle") {
						const Variant &value = p_value;
						if (!setting) {
							setting = true;
							undo_redo->create_action(TTR("Animation Multi Change Keyframe Value"), UndoRedo::MERGE_ENDS);
						}
						Vector2 prev = animation->bezier_track_get_key_in_handle(track, key);