No one else has reported these problems, I guess it’s related to my account (I think the “cloud” quota is incorrect and generates a whole bunch of problems).
But thanks to @Angelo, I’ve a new fresh account for all my test .
As there doesn’t seem to be any progress on resolving this bug, I suggest just deleting the account and closing the ticket.
If others encounter it, it can always be reopened.
I can keep this account if you thing it can be usefull (if you still want to identify the problem and solve it), otherwise I’ll delete it shortly.