### Godot version

4.2 RC2

### System information

Any

### Issue description

https://github.com/godotengine/godot/assets/61938263/42ed582f-7b87-424c-8d19-ba0650ead5aa

It should not be reset by pausing.

### Steps to reproduce

Pause AnimationPlaybackTrack

### Minimal reproduction project

N/A
HashMap<NodePath, AnimationMixer::TrackCache *> ret;
	for (const KeyValue<NodePath, AnimationMixer::TrackCache *> &E : data) {
		AnimationMixer::TrackCache *track = get_cache_copy(E.value);
		ERR_CONTINUE(!track); 
		ret.insert(E.key, track);
	}
	return ret;
}
void AnimatedValuesBackup::clear_data() {
	for (KeyValue<NodePath, AnimationMixer::TrackCache *> &K : data) {
		memdelete(K.value);
	}
	data.clear();
}
AnimationMixer::TrackCache *AnimatedValuesBackup::get_cache_copy(AnimationMixer::TrackCache *p_cache) const {
	switch (p_cache->type) {
		case Animation::TYPE_VALUE: {
			AnimationMixer::TrackCacheValue *src = static_cast<AnimationMixer::TrackCacheValue *>(p_cache);
			AnimationMixer::TrackCacheValue *tc = memnew(AnimationMixer::TrackCacheValue(*src));
			return tc;
		}