It was a pleasure for me to help finding the reason for this bug.
I am very happy, that we all now have a workaround until Google or the GOS team will find a solution for the use of all fingers for all profiles.
Murcielago
Yes, I know, it works only if you don't end sessions of additional profiles.
Oh, no, wait, this was long time ago, when I have used two profiles until the issue began…
Have it tested right now, because you mentioned it and I was very curious if this issue is solved also…
And it works for me here on my Pixel 7 Pro!
I have selected my second profile and because it's a new session, I had to key in my password.
Then I have ended this session to go back to owner profile.
Here the fingerprint reader shoes me instantly the fingerprint symbol, not the lock symbol.
And now it works the first time I log in. :-)
Maybe you have to repeat the steps once more, until the device stores it all the right way?
Good luck!