### 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?)
keydata.second = v;
								insert_queue_new.append(keydata);
							}
						} break;
						case Animation::TYPE_VALUE: {
							for (double delta_t = 0.0; delta_t < anim_len; delta_t += dur_step) {
								Pair<real_t, Variant> keydata;
								keydata.first = delta_t;
								keydata.second = animation->value_track_interpolate(i, delta_t);
								insert_queue_new.append(keydata);
							}
						} break;
						default: {
						} break;
					}
					
					int key_len = animation->track_get_key_count(i);
					for (int j = key_len - 1; j >= 0; j--) {
						undo_redo->add_do_method(animation.ptr(), "track_remove_key", i, j);
					}
					
					undo_redo->add_do_method(animation.ptr(), "track_set_interpolation_type", i, is_using_angle ? Animation::INTERPOLATION_LINEAR_ANGLE : Animation::INTERPOLATION_LINEAR);
					for (int j = insert_queue_new.size() - 1; j >= 0; j--) {
						undo_redo->add_do_method(animation.ptr(), "track_insert_key", i, insert_queue_new[j].first, insert_queue_new[j].second);
						undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", i, insert_queue_new[j].first);
					}
					
					undo_redo->add_undo_method(animation.ptr(), "track_set_interpolation_type", i, animation->track_get_interpolation_type(i));
					for (int j = key_len - 1; j >= 0; j--) {
						undo_redo->add_undo_method(animation.ptr(), "track_insert_key", i, animation->track_get_key_time(i, j), animation->track_get_key_value(i, j), animation->track_get_key_transition(i, j));