I have a run of the mill jetpack app, with a Scaffold setup. The top bar composable is supposed to display the username once they log in, but recomposition is not triggered. This is the code (I replaced the regular top bar with a simple Text, for simplicity)

class AppActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            EdocClientTheme {
                val navCtrl = rememberNavController()
                Scaffold(modifier = Modifier.fillMaxSize(), topBar = { TopBar(navCtrl) }) { innerPadding ->
                    NavigationContainer(navCtrl = navCtrl, modifier = Modifier.padding(innerPadding))
                }
            }
        }
    }
}
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun TopBar(navCtrl: NavHostController) {
    val vm = viewModel<AppViewModel>()
    val loggedIn = vm.loggedIn.collectAsStateWithLifecycle()
    Log.i("DEBUG MSG", "Recomposing TopBar")
    Text("---${loggedIn.value}", modifier = Modifier.padding(24.dp)) 
}

This is the ViewModel in which I added a subscription to the loggedIn flow to check whether the value is actually updated

class AppViewModel : ViewModel(){

    private val _loggedIn = MutableStateFlow<User?>(null)
    val loggedIn : StateFlow<User?> = _loggedIn

    private val _loginError = MutableStateFlow<String?>(null)
    val loginError : StateFlow<String?> = _loginError

    init {
        viewModelScope.launch {
            loggedIn.collectLatest{ u -> Log.i("DEBUG MSG", "Logged in is now ${u}")}
        }
    }

    fun logIn (username : String, password : String){
        viewModelScope.launch {
            try {
                _loggedIn.value = ApiClient.login(username, password)
            } catch (e : Exception){
                _loginError.value = e.message
                Log.e("LOGIN_ERROR", e.message, e)
            }
        }
    }

}

When the login function is invoked, I can see the log message printed by the ViewModel coroutine, and also, another composable that depends on the loggedIn state in the same way as TopBar is recomposed, but TopBar isn’t. Is there something particular about composables being passed as parameters that makes them work differently?