Not sure how well known this is, but the "Preserve users and related tables" option when requesting a Clone has been disabled in the datacenter since May 1st, 2020. So, selecting it has NO effect on the clone.
Here's a link to a KB article about it and describes the workaround for it:
I've asked why the option is still available and why the documentation has not been updated yet. Extremely misleading and you are forced to deal with the fallout after a clone.