Android 15 can automatically delete your face or fingerprint unlock if they aren't working well - eviltoast
Android 15 can delete your face or fingerprint unlock when they aren’t working well and then prompt you to set them up again.

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.