I doubt if the exact underlying issue (like a peer is recognized in one app but not another, or different effects with the same peer, etc.) could be reproduced in a manner that can help the developers fix the issue.
But I do remember a few times in qtorrent when I tried "force recheck"ing a torrent. Doing a recheck seems to reset the progress on "Partial" pieces and in a few occasions it did allow another peer to upload to me these pieces. However this should only work when the piece(s) are available.