I’ve reported this to FP already, but I have found a bug with Android 10.
Whenever 4g LTE or WifiCalling are used, any calls that come through this method do not display phone numbers - they show up as Unkown Caller. However, if 4g LTE is disabled and not connected to wifi, caller details display. The same is true with wifi calling. If wifi calling is enabled when connected to wifi, the call comes through as unknown caller. This happens on both SIMs and I have reset my phone to factory default and the issue persists.
I have two sims, both run on the o2 network. One is an o2 sim, the other is on giffgaff. Both are UK networks.
Anyone else getting this problem?
[Edit: I’ve added the current workaround as the solution until FP fix this. Anyone new with this issue should report to FP too]