Wifi blocks incoming calls on ios 18.1.1

Whenever I am connected to wifi, incoming calls go straight to voicemail. Have T-mobile, have wifi calling disabled, just using wifi for data. This is happening with my wifes phone too. I have 15 plus, she has 15 pro max. IOS 18.1.1. As soon i disable wifi calls come in.

If you running IOS 18.1.1 on iphone 15 you should test calling yourself couple of times with wifi connected.