The Bitwarden web vault has several preferences. For example, whether or not to display site favicons, and whether to use a dark/light/system theme.
Currently, those preferences are not saved with the user’s account (or it’s broken). I’m guessing they are stored in a cookie or another form of transient storage.
Can the user’s web vault preferences please be saved as a few bytes of data in the user’s profile? That way, all those settings do not have to be configured and customized every time the user logs in. More and more people clear cookies regularly, so cookies and other types of transient browser storage are not an effective and reliable way to store such settings.