New [11.0 Stable][Mi8] Can't make calls with WCDMA/LTE network type

[⫷ CRƎΛT1VE_ ⫸]

I can't make calls with the named network type.

Always getting this error:

If network type is set to GSM/WCDMA/LTE or GSM/WCDMA auto/preferred, everything works as intended.

My provider said everything's all right on his side, so I believe it could be a ROM issue?

I live in Germany, system language is set to English.

Device: Mi 8, dipper
Rooted
No Custom Kernel