In offline mode, one weekly quest, namely the Trickery and Tribulation (complete the weekly event), appears to be completed and its reward claimable. It goes without saying, that I don’t play offline but periodically check that the offline data have been successfully updated with the current online progress.
I don’t know if there’s a possible relation to a similarly haphazard issue I described in a thread a couple of months ago, although that was about online mode and its resolution was simply a matter of re-logging.
The apparent workaround for this offline mode issue is to claim the quest reward and then replace the offline progress with the current online one, although this won’t, obviously, explain the reason as to why the issue arises in the first place.
Thank you for your support.