### 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?)
for (const KeyValue<int, List<float>> &E : key_ofs_map) {
		int track = E.key;
		for (const float &key_ofs : E.value) {
			int key = animation->track_find_key(track, key_ofs, Animation::FIND_MODE_APPROX);
			ERR_CONTINUE(key == -1);
			String name = p_name;
			if (name == "easing") {
				r_ret = animation->track_get_key_transition(track, key);
				return true;
			}
			switch (animation->track_get_type(track)) {
				case Animation::TYPE_POSITION_3D:
				case Animation::TYPE_ROTATION_3D:
				case Animation::TYPE_SCALE_3D: {
					if (name == "position" || name == "rotation" || name == "scale") {
						r_ret = animation->track_get_key_value(track, key);
						return true;
					}
				} break;
				case Animation::TYPE_BLEND_SHAPE:
				case Animation::TYPE_VALUE: {
					if (name == "value") {
						r_ret = animation->track_get_key_value(track, key);
						return true;
					}
				} break;
				case Animation::TYPE_METHOD: {
					Dictionary d = animation->track_get_key_value(track, key);
					if (name == "name") {
						ERR_FAIL_COND_V(!d.has("method"), false);