### 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_ROTATION_3D: {
							for (double delta_t = 0.0; delta_t <= anim_len; delta_t += dur_step) {
								Pair<real_t, Variant> keydata;
								keydata.first = delta_t;
								Quaternion v;
								animation->rotation_track_interpolate(i, delta_t, &v);
								keydata.second = v;
								insert_queue_new.append(keydata);
							}
						} break;
						case Animation::TYPE_SCALE_3D: {
							for (double delta_t = 0.0; delta_t <= anim_len; delta_t += dur_step) {
								Pair<real_t, Variant> keydata;
								keydata.first = delta_t;
								Vector3 v;
								animation->scale_track_interpolate(i, delta_t, &v);
								keydata.second = v;
								insert_queue_new.append(keydata);
							}
						} break;
						case Animation::TYPE_BLEND_SHAPE: {
							for (double delta_t = 0.0; delta_t <= anim_len; delta_t += dur_step) {
								Pair<real_t, Variant> keydata;
								keydata.first = delta_t;
								float v;
								animation->blend_shape_track_interpolate(i, delta_t, &v);