Local account resets sporadically on login

With no predictable frequency, on login, my existing account will not be recognized, and MacOS will attempt to create a new account, like if I was logging in for the first time.

I'll explain the configuration. I host only one admin account on the built-in SSD storage: recovery. I use it for that purpose only, and I've been using it more frequently than I would like. Home directory - /Users/recovery.

I have a PCIe 2TB OWC Accelsior 4M2 (480 GB x 4 SSD) in a JBOD configuration for all other user accounts. I've allocated two APFS (Case-sensitive) volumes:

1) Admin-level user (no quota; my account). Mount point - /Volumes/UserA. UserA account profile is configured to use this as the home directory. Symlink /Users/UserA points to /Volumes/UserA

2) Non-admin user (660 GB quota) - /Volumes/UserB. UserB account profile is configured to use this as the home directory. Symlink /Users/UserB points to /Volumes/UserB.

The behavior I am about to describe happens with both accounts, but more frequently observed with UserA than UserB, just because UserA is on more frequently. For about 70-80% of the successful login attempts, login works as expected and UserA logs in and loads the home directory of /Volumes/UserA. When it doesn't work, UserA login beings the account initialization process, as though I am logging in for the first time. After this happened the first couple of times, I learned it is just best to quickly skip through the steps (skip iCloud login, etc), then immediately log out and begin remediation.

To remediate, I log into the recovery account. When I look in the /Volumes/ directory, now there is a new directory there, /Volumes/UserA 1, which is actually the APFS volume that is supposed to mount at /Volumes/UserA. /Volumes/UserA is now a new folder. To correct, I delete /Volumes/UserA, unmount the APFS volume that is supposed to mount at /Volumes/UserA, remount the APFS volume, and now the APFS volume is correctly remounted to /Volumes/UserA. I log out of recovery and restart.

After restarting, I attempt login to my account again, and normally it works without issue. I think I've had 1-2 instances where the problem repeated, and I had to go through the remediation steps again.

I cannot figure out a pattern of what causes this. I've had it happen when I logged in immediately after starting, and some times it's happened hours after I powered on the computer. I do not know where in the log files to look for any information that I can use to diagnose the issue, and searching the log files in Console app for "Volumes" and "UserA" haven't returned any results.

MacPro 2019, MacOS 12.6. I should also note this hasn't been the behavior since I bought the MacPro in late-2020. It only started happening in the past few months. I can't say for certain it started after I installed MacOS 12.3/12.4 or not, but I seem to remember it starting around that time. Problem persists through MacOS 12.6.