@ilja I can be very precise about what I was doing, but this problem appears totally randomly since I always did the same thing and it seems that on 6000 relisting this one was the only one to disappear again. So, I selected a folder that contained a lot of listings (all expired, all auto-relist on but actually not automatically relisted because update is off), selected all with cmd-a, modified some settings (one html code into the 5th info box, cmd-c + v), then activate the “offer” option, changed 30days to GTC, then relisted with the command in top bar under ••• . I went back and could check that the crash I sent you was not related to this “disappearance” but happened before while I was not relisting.
Besides there are no ways to notice this bug except one: relist, wait a bit, check ebay category (how many listings are inside), check GS folder (which scheme is the same of ebay shop’s categories) and see if the number is the same. As in the case shown in upper video, in ebay category there was one listing more. So, let’s check sub categories ebay-GS until you find the one with 1 listing less in GS. Then one buy one until you find that “disappeared”… I checked in this way 5600 listings 
and found more than 100 disappeared.
@ilja does it make sense ??
Ah yes of course I can recall. The double option was disables and “move” was set to “trash”.