Skyril Unfortunately the way GrapheneOS operates it's update processes and the fact there are constantly new releases covering the latest security fixes, bug fixes and additional features not just for the OS but for the browser too, you'll likely never be more than a few hours from a previous update before an issue arises.
This means many people make the correlation connection but in all likelihood there isn't a causation one as it would affect more people and result in people testing beta/alpha builds to alert the team over in our Testing Channel on Matrix before rolling out to stable.
I have read this may be a solution:
Wipe cache partition [ Fingerprint sensor not working on Google Pixel 5 ]
This particular method requires you to boot into the recovery mode. If you aren’t comfortable with it, we strongly recommend skipping this method. For those who want to proceed, you can clear your Google Pixel 5 system cache using this feature. Here’s how it works.
Turn off the your Google Pixel 5.
You need to enter the recovery mode. Use can use Volume DOWN + Power buttons. You’ll need to keep the buttons pressed till the phone boots in bootloader mode.
Now, use the volume rockers to change between options. The power button is used for selection here. Note that the touchscreen doesn’t work here.
Select Recovery and Press Power.
On No Command Screen hold volume up and press power once.
Select “Wipe Cache Partition”.
Finally, “Reboot the system now” and it is done.
Verify if the fingerprint scanner works or not.