TL;DR
- Strings in the latest Android 15 beta suggest the OS can automatically delete biometrics that aren’t working well.
- Android will delete your face or fingerprint unlock when they aren’t working well and then prompt you to set them up again.
- We don’t know how the OS determines when a biometric isn’t working well or if this feature is even live yet in the latest Android 15 beta, though.
PSA: Stock Android phones, since… maybe Android 12.x or so(?), have a Lockdown mode in the power button shortcut menu that disables bio unlocks and forces pin or password.