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There is an app called Session which I think uses the Signal protocol under the hood. It doesn't depend on phone numbers at all.
https://getsession.org/
Hey, same problem! I even opened a bug report at the time, which devs said they couldn't replicate :(.
I just looked last week out of curiosity. Apparently they figured it out sometime in 2019, and it had something to do with avatars. How odd.
Specifically, check the reply from LNFelton here - https://github.com/wireapp/wire-android/issues/777
https://jami.net/ open source and doesn't require a phone number.