70779c3 created the issue
While the S3 interface displays the "deleted" S3 files when using "View -> Show Hidden Files", actually downloading the file downloads the most recent object of the same name.
Interestingly, the Transfers window, when completed, shows this:
"Download Complete, CURRENT_OBJECT_SIZE of PREVIOUS_OBJECT_SIZE"
so you can get funny messages like:
"Download Complete, 25 M of 89.2 K"
(also, the "common problems" link of the new ticket guidelines is a 404 "Page help/en/problems not found")