I have the same question.
I have over 2000 active updownloads task
And now there is one task that is sometimes updated on the forum (new video tutorials on blender are added), sometimes files are added there to the same ID on the forum, and the torrent file is updated + its hash, and it must be downloaded again. You download a new .torrent file - the hash of old files will be updated, and new video lessons will be downloaded additionally, and profit.
If this is not done, the old hash is no longer on the tracker and the response arrives is an "unregistered torrent".
The task status is W