### 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?)
setting = false;
				return true;
			}
			if (name == "out_handle") {
				const Variant &value = p_value;
				setting = true;
				undo_redo->create_action(TTR("Animation Change Keyframe Value"), UndoRedo::MERGE_ENDS);
				Vector2 prev = animation->bezier_track_get_key_out_handle(track, key);
				undo_redo->add_do_method(animation.ptr(), "bezier_track_set_key_out_handle", track, key, value);
				undo_redo->add_undo_method(animation.ptr(), "bezier_track_set_key_out_handle", track, key, prev);
				undo_redo->add_do_method(this, "_update_obj", animation);
				undo_redo->add_undo_method(this, "_update_obj", animation);
				undo_redo->commit_action();
				setting = false;
				return true;
			}
			if (name == "handle_mode") {
				const Variant &value = p_value;
				setting = true;
				undo_redo->create_action(TTR("Animation Change Keyframe Value"), UndoRedo::MERGE_ENDS);
				int prev = animation->bezier_track_get_key_handle_mode(track, key);
				undo_redo->add_do_method(this, "_bezier_track_set_key_handle_mode", animation.ptr(), track, key, value);
				undo_redo->add_undo_method(this, "_bezier_track_set_key_handle_mode", animation.ptr(), track, key, prev);
				undo_redo->add_do_method(this, "_update_obj", animation);
				undo_redo->add_undo_method(this, "_update_obj", animation);
				undo_redo->commit_action();
				setting = false;
				return true;
			}
		} break;