I don't know how recent it is (at least after the 4 may) if it's due to the very last changes or not but I have a password with a non ascii character "é" that transformed into "é".
Full story :
A website I rarely go on have completely changed its url making it impossible to auto fill the login, so I retrieved it via the password manager and after it failed I discovered this. Perhaps it has always been saved like that and still would correctly work in the old website, I can't tell, but one last detail, after that I tried to delete this old login entry and nothing happened . I had to edit the password before it worked, I also tried to add a new entry with weird characters to see if it was reproducible and I could delete it without any problem, so my guess is that there were some conversion bug occurring at some moment.