One more FP4 with exactly the same issue as described above.
It started a few days ago. I thought it was connected to an update of the Android Auto of my new car, but I think that is weird. Issue: exclamation marks and offline mode although 5G symbol is there. No APN reset or going to 3G or 4G would work.
I just tried the workaround of disabling the eSIM and seems to be working normal with just the physical SIM card. Not ideal but okay for now. I also reported the issue to customer service with no reply yet.