rusticus1999 Pixel 7 user here having the same issue, which started right after the last update.
Powered the phone down, which didn't resolve the issue.
When the phone rings, usually the screen is completely dark, so a power button tap brings it active. Then, for me since I don't use fingerprint scans, I type in my 6 digit code, then swipe down and find the call notification, tap the arrow, which then offers me the answer and decline options for the call
.