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The first issue is attempting to get last update time in OfflineIndicatorViewModel. It was trying to wait for partial login but unfortunately temporary login is also partial login.
We didn't want to just return null in this case as it might get interpreted incorrectly and instead we returned a sum type with the exact case and ignore uninitialized storage in this case.
The other issue was with LoginController and LoginListener not properly resetting themselves on logout (e.g. after temporary login) and giving incorrect results.
The third issue was with PostLoginActions initializing MailModel for temporary login. If a real login into another account is attempted afterwards it would lead to more errors.
To fully solve the problem we should rethink how temporary login affects the rest of the app and perhaps skip most of the things that happen during normal login.
fix #4559