On my Redmi 3S, I jumped from 7.2.9 (8.2) to 7.3.2 (8.3) but I was unable to receive calls.
Tried to revert back to 7.2.9, but now I receive a lot of FCs (gallery, notifications, recorder...) and my second SIM is not working.
Hopefully I can still fix it, by updating to another ROM.