Safari forgets saved passwords of random websites

[tom89]

I use iCloud Passwords and have noticed over the past few months that all saved passwords for individual websites have disappeared (e.g. saved passwords for several Google accounts). For all these affected websites, there is only one entry in the password list left in the Safari settings with the content "never saved". This only affects very few websites, the majority of the passwords are still there and they sync with other devices. Nevertheless, the behaviour is of course very disturbing. Is there a reasonable explanation for this? I have already considered whether, for example, all saved passwords are deleted as soon as "never save" is selected when a new account is created on a particular webseite, but such a behaviour would also be potentially very destructive.