QBT ignores manually added fully completed files on forced re-check

[mzso]

qBittorrent version and Operating System

4.0.3 Win8.1

What is the problem

Sometimes I have two torrents downloading for the same stuff because of excruciatingly low download speeds. So when I had a bunch of finished files I copied them into the other's folder. But they were ignored.
I didn't even attempt to download in the same folder as I used to do with µt, because QBT's wacky and unreliable behavior. Such as #2798
With µt I could just enabled/disable files at will (including incomplete ones) a force a recheck without any issue. (When I accidentally had the same files downloading in both torrents one of them would/might stop for failure to write, IIRC)

What is the expected behavior

QBT should check those files

Steps to reproduce

Download some files in one torrent, download some others from the same pack of files but from a different torrent, then copy them to the first torrent's folder. Force a recheck. Observe what happens.

[rlesac]

I think I have the same issue.
I have fully downloaded torrents, and want to seed them.
I download the .torrent file, add to qBT in paused state, open destination folder, copy over the files, force recheck but nothing happens.
I have a bunch of torrents I can't seed because of the bug.

[Seeker2]

Duplicate of: #6124

[samishii23]

This might help. Make sure the .!qB file extension for partial files is disabled. Reload the software ( let it exit gracefully. mine takes a couple minutes to due to how many torrents I have in it... ) Try the force recheck after the software reloads. With 4.0.3 my previously completed torrents have come back to life ( finally! ).

[ngosang]

We are closing all issues related to old qBittorrent versions (qBittorrent < 4.1.0).
Please, update to last release and, if the bug/error/crash is still present, open another issue.
Thank you.