I have a Pixel 7 with three active profiles - Owner, User1 and User2. The pins have been entered for User1 and User2 are both are authenticated for use with fingerprint.

While on User1:

Switch to User2
Once inside of User2 but before any authentication has taken place, the "lock" graphic displays
Then, shortly after and as expected, the "fingerprint" graphic takes its place, signalling that User2 is ready to accept a fingerprint
Log in to User2 by fingerprint

Once inside of User2:

Switch back to User1
Once inside of User1 but before any authentication has taken place, "lock" graphic displays

Expected:

the "fingerprint" graphic to display

Actual #1:

The "lock" graphic displays indefinitely
If I fully place my finger onto the "lock" graphic as if actually trying for fingerprint authentication, the number pad displays, ready to accept a pin
If from the number pad I swipe back, the "fingerprint" graphic is now visible
User1 becomes able and ready to accept a fingerprint for authentication

Actual #2:

The "lock" graphic displays indefinitely
Slightly touch the edge of the "lock" graphic
"Fingerprint" graphic is now displayed and User 1 becomes able and ready to accept a fingerprint for authentication

I am not able to reproduce this on P6. I have never noticed this behavior on P6 or P6a. I have used P7 for a few days and noticed this immediately.

Can anyone reproduce?