Hi I have since the last update the problem, that if I get phone call I may not take this call. i see the prompt to get a call but I may not click onto it. It shows no reaction and rings with a tone till the caller is hanging up.
I also tried a different call app from f-droid store and set it as default but this app - called Amadz - do not work also as the deflaut caller app that installed onto the fairphone 4.
When I switch the pin security off of my phone I may take every call but the display shows everytime a get a message or something else the display.
Does the 3-bullet points also fit your experience, that it was not every call that was impossible to take, just the ones that occured in the time just right before your screen locked?