Soft Proofing In Lightroom

I've been using LR for a long time and often use soft proofing to print, especially when I have to send a file to an outside printer. I am about to send a big job to Whitewall, and I've been noticing strage behavior whiile soft proofing. My normal procedure is to go into soft proofing mode ("s"), select the desired profile and rendering intent w/ Simulate Paper and Ink checked. Then click "Create Proof Copy" and using the Before/After screen adjust the proof preview to match the master copy. I've noticed lately that the master copy sometimes looks different in soft proofing mode. I know the surround changes to match the paper brightness, but that is not what I'm talking about. The master copy itself sometimes, but not always, looks different. If I toggle "s" while in the before/after screen, both images change their appearance when the master copy looks different.

On the other hand, when the soft proofing mode seems to be working, turning soft proofing on/off only changes the Proof Preview; the Master Copy does not change. If I CMD Z to back up so the soft proof goes a way, it sometimes fixes the issue and then works normally. But sometimes it just keeps doing it. Exiting out of LR usually fixes it for a few images, but then it randomly happens again. I cannot seem to find a common denominator like a specific image type or virtual copies.

It feels like this is a bug. Has anyone else noticed this?

MBP 16in 2021 / Apple M1 Max

Monterey 12.6.3

LR Classic 12.3

Dave