Hi! This happened to me today:
I installed the Android 11 Public Beta 1 today from June Android 10 version. I have an unlocked 4 XL. I flashed (trough fastboot) the June update and my facial recognition got broken. I did factory reset it but nothing was fixing it. I went back to Android 11 Public Beta 1 and it worked. Then I downloaded and flashed January Android 10 version and it is working right now. Will update if after setting it up and updating it to last update will still work.
Update: It was broken on the June update... Sad for that. Then I read a post and installed the June update for Telstra only (via OTA) and it is working for now and pretty well. Waiting for the normal update to come out and will install it via OTA through ADB.