Signal Crashes When Biometrics Become Unavailable

[x] I have searched open and closed issues for duplicates
[x] I am submitting a bug report for existing functionality that does not work as intended
[x] I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
[x] This isn't a feature request or a discussion topic

Bug description

Signal for Android Crashes When Biometrics Become Unavailable

Steps to reproduce

Pixel 6 had a bug that prevented fingerprint reader from being available if animation scaling was adjusted, had mine adjusted to 0.5x in all settings.
Had a fingerprint fail a few times and then the sensor icon went missing, didn't think anything of it.
Went to go send a message in Signal and the app would show the biometric unlock, however the sensor wouldn't register. Clicked to enter PIN and app crashed.
App continually crashed from then on when loading, was never able to unlock in this state.
Tried force stopping and reloading app - same issue: app crashes, cannot get into Signal.
Tried clearing cache, force stopping and reloading - same issue: app crashes, cannot get into Signal.
Submitted an app crash debug 2-3x on Saturday, November 27th when prompted.
Noticed that when entering another app that required biometrics to unlock - it fell back to password authentication and gave me no option for fingerprint unlock.
This is when I realized the reason Signal was crashing was because biometrics unlock was unavailable. This seemed to be the root cause of app crash.
Changed scaling back to defaults, disabled Developer Options, rebooted phone and fingerprint unlock became available again - and Signal was able to be unlocked with no crash.

Actual result: Signal crashes when biometrics were set for unlocking the app, but became unavailable in the system. Expected result: Signal should fall back to prompting to unlock with PIN. Other apps fell back to alphanumeric input as authentication, whereas Signal did not handle the scenario and instead continually crashed.

Device info

Device: Google Pixel 6 Pro Android version: 12 (build SD1A.210817.037), Android Security Update: November 5, 2021 Signal version: 5.26.11 Links regarding issues of fingerprint scanner on Pixel 6: [0] https://www.reddit.com/r/GooglePixel/comments/qk7bel/psa_aod_fingerprint_icon_broken_by_animation/ [1] https://www.tomsguide.com/news/google-pixel-6-fingerprint-sensor-can-stop-working-if-you-run-out-of-battery

Final Notes

Have provided a workaround for Signal crashing, specifically for the Google Pixel 6. However it seems that the fingerprint security system may have other issues (link [1] above) that may inhibit the fingerprint sensor from working. If Signal is setup to use biometrics for unlock it seems others may run into this issue but hopefully this is enough information to find how to gracefully handle this situation in Android if and when it occurs again.

Link to debug log

No debug available, however submitted app crash debug via Android system on the afternoon (US Central Time) of Saturday, November 27th. Do not have exact time.

signalapp / Signal-Android