MetroPCS: incoming calls are not getting through when wifi is connected - Xiaomi Mi 9 Questions & Answers

I'm experiencing a weird issue on MetroPCS network, sometimes after phone was connected for a while to a wifi network incoming calls are not getting through. The caller hear ringing and eventually get to voice mail, but the phone does not ring, nor it shows missing calls. If I call someone from the phone, then it fixes the incoming calls issue (or if wifi disconnected).
MetroPCS has wifi-call feature, but the phone doesn't have it (right?) is that somehow related?
Using MIUI 10 Global Stable EEA V10.2.30.0.PFAEUXM
Thanks.

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