Expected results

Absence of deadlocks.

Actual Results

Process locks up waiting for m_user_mutex on https://github.com/realm/realm-core/blob/72fefa1b0c07cb87e1078c039d1d9572dd92fa58/src/realm/object-store/sync/app.cpp#L600 when the current_user is accessed from an "app listener callback".

Very similar to https://github.com/realm/realm-core/issues/7183 (except this was for User).

Steps & Code to Reproduce

The following JS code reproduce the issue:

import Realm from "realm";

const app = Realm.App.get("realmjstestapp-jjhtf");
const credentials = Realm.Credentials.anonymous(false);

setInterval(() => {
    console.log("Still alive");
}, 1000);

app.addListener(() => {
    console.log("Current user is", app.currentUser);
});

await app.logIn(credentials);

Core version

Core version: https://github.com/realm/realm-core/commit/8f9661524e3087d9886456d2ce555ea2629eb813 (most likely caused by https://github.com/realm/realm-core/pull/7300)