User 'A' is the owner of a shared calendar, and has subscribed user 'B' to view, edit, and delete entries on the shared calendar. User 'B' posts a "posted reminder note" to the shared calendar and then is unable to delete that same "posted reminder note". User 'A' can delete the posted reminder note. User 'B' was able to delete before, but it stopped working.

I have already tried deleting/removing user 'B' from the shared calendar and adding them back in again with all the same rights: view, edit, delete, and the same problem keeps happening. As far as I know, nothing has changed on the client or server side.

Any help on resolving this would be appreciated!