...And this is extremely disappointing.
Well, already vastly posted in General Support. Bug acknowledged, investigated, fixed in exp, fixed in stable and fix released. So it's nothing even remotely new or deserving *further* data than the two-dozens-or-so of threads didn't already cover in detail.
But the damage the bug caused is not undone. Devs already know everything about that - including profile binary dumps in some cases! - but didn't provide a way to fix that damage. Pity.