completed torrent became corrupted and not completed

[gattovicentino]

Hi all,
this is the issue:

I completed the download of a torrent (a single file of 336.3 MB) about 2 months ago.
So, since July this file has been in seeding, until yesterday, when I saw it was no more present in seeding list: it was in error list with a "corrupted data" error.
I forced it to start again and...surprise, it was 99.9% completed, missing 0.3 megabytes.

My question is: how could a file have been correctly in seeding during 2 months (completed, green bar) and now be incomplete and needing 0.3 mb to complete?
Hard disk health is good, there are no bad sectors or errors, I just did many tests on it with various tools.

Any idea?

Thanks...

[gattovicentino]

Peers list is empty now... so I think there is no webseed...
But the trackers show the presence of 5 seeds about 25 minutes ago.

I still can't understand how a completed torrent can become incomplete.
What would have happened if I have copied that file to a pendrive some days ago, or one month ago, when Transmission was showing it as "completed"? Would I have copied an incomplete file or a completed one?

[cfpp2p]

I still can't understand how a completed torrent can become incomplete.

https://trac.transmissionbt.com/ticket/5912

[gattovicentino]

very interesting issue, fortunately is a very infrequent problem and Transmission warns about it, when it happens... If not, who knows when I would have noticed!