I posted this almost 3 months ago Deleted characters from a long time ago are showing up in Beta Character Copy selection screen no response, though
None of those 14 character’s names are available to be used on new characters, so that is a serious bug and has to be fix. Plus, one of the level 10s appears under View All Characters on the official website, as well as being able to search for it. All 14 should’ve been permanently deleted.
So it might be part of the reason why they disabled it, other than the other serious bugs that started around early June.