I have the same problem on eSIM card :(
In my opinion iPhone cloud loose signal during changes a mobile transmiter.I see this problem only when iPhone is in the move ( eg in car when using CarPlay). What I call at home everything is ok
mgmiter
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Third beta resolved problem
Third beta resolved problem with IMAP :D
I see in feedback assistant that there are more than 10 similar reports. It’s very little. Quite strange
the same situation as in first beta :(
still doesn't work in beta 2 :(