@clifton this is one of the big questions that need to be answered from others. But I know in some, such as at NOTICE: Unexplained Data Loss Issue - #99 by danelledawn, it was said that they have it synced and the passwords weren’t visible on any device. Same with NOTICE: Unexplained Data Loss Issue - #65 by baduser where they said checked sessions from Sync and passwords vanished everywhere.
Same was true for Update deletes my passwords and autofill data - Windows 11 using 1 profile only where they said data was being lost. Though I never did ask @hunsinge if the other devices had issues or if the missing password was just on Desktop and it was able to sync passwords back later?