It would be helpful to nonetheless quickly release the manual install file for Android 13 (perhaps with a link to this topic here for a warning) … https://support.fairphone.com/hc/en-us/articles/360048050332.
Since a number of users have upgraded already and are experiencing other issues apart from the fingerprint sensor situation, a manual install from scratch could be used to determine whether certain issues are really due to the Fairphone OS version itself or rather due to the in-place upgrading process.