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Workaround for very rare fingerprint firmware glitch with Android 15 QPR2:
This applies to the stock Pixel OS, GrapheneOS or another OS based on Android 15 QPR2 running on Pixel devices with the OS providing the latest firmware released this month.
This issue appears to be specific to the non-Pro Pixel 9. We have no reports of it happening on any other device models. We're continuing to look into it. Perhaps we can find a workaround for it before there's a patch for the stock OS / AOSP such as retrying connecting to it.
I did not have that glitch, but thanks for the info !!! 
@GrapheneOS As mentioned in the Discuss thread, fingerprint might not be available right after the upgrade. One has to reboot, let the "App optimization" process finish (optimization + reboot) then reboot again. After that fingerprint settings and reader will be available again.
@Lotusgris You don't have to let app optimization finish.
LB: I've been having the same issue this morning. Didn't really think much about it, figured I was just being clumsy or something. But nope, the update borked the fingerprint reader.
However, I restarted and it's all working properly again.
Just in case anyone who follows me also uses @GrapheneOS on a Pixel 9.