In the last few months, with both my pixel 5 and my new pixel 6 phone, me (and others I know) have been experiencing the same issue. Incoming calls don't consistently display on the home screen on the first ring, if at all. Often, even unlocking the phone doesn't even show the call for answering while the call is still ringing. This leads to many missed calls. Sometimes it will finally appear after 3+ rings. As a fundamental feature of a phone, booty being able to quickly answer a call is bad.