iPhone 11 Pro - Bouncing LTE after updating to IOS 13.2

I have an issue with my new iPhone 11 Pro.

LTE is bouncing sometimes and unable to make call - carrier is unreachable.

Issue can be reproduced only on 11/11 Pro devices and only on ios 13.2

I made everything: clean install, reset, changed sim card, disabled Volte - no luck. When I selecting only 3G - everything is fine, exept 4G.

I made call to provider - Kyivstar, Ukraine, and got answer from tech department that issue only related with my device. Ok. After that I did downgrade IOS to 13.1.2 and voila - LTE started working as it should be.

Also I've found that issue affecting my iPhone only when I reaching cover B3+B7 base station, when I connected only to B3 station - LTE is ok.

Issue tested on: iPhone 11 Pro, iPhone 11 Pro Max, iPhone 11

btw: other ukrainan carriers: lifecell and vodafone are working fine even on 13.2.