4.2.3 Screenlock Does Not Unlock - "Authentication Failed" - when password entered correctly

[SenorFusion]

Qubes OS release

4.2.3 (Upgraded In Place from 4.1)

Brief summary

The xscreensaver lockscreen login after locking the machine or it going to sleep with xscreensaver fails to unlock when the password is entered correctly.

Steps to reproduce

1. Lock the screen or allow xscreensaver to lock the screen automatically after 10 minutes
2. type in password
3. screen appears to blink or reload while typing pw occasionally (but doesn't happen every time)
4. receive "Authentication Failed"
5. Type in password 3 to 10 more times until screen finally unlocks

Expected behavior

Type in password and the screen unlock

Actual behavior

"Authentication failed"

Notes

I am positive I did not suddenly forget how to type in my password. Logging in on boot and intial login does not have this problem.

Other users on the forum have reported this

This is not the same failure as #8473 - in mine, the login screen is already visible.

Please let me know what log to pull for diagnosis.