1. The extension can't reset the unwatched filter because it is using YouTube history, if youtube history is broken, it will not show too.
2. Youtube disabled watched status for shorts, for this reason, extensions don't provide this feature for shorts too.
3. I can't reproduce by clicking the subs group doesn't load any videos, could you please send screenshots or even videos to hello@yousub.info Maybe you have a conflict with other extensions because I don't see similar requests.