Don't use lobby join method if server isn't probed yet when required

src/join/lobby.rs

@@ -21,6 +21,12 @@ pub async fn occupy(
 ) -> Result<MethodResult, ()> {
     trace!(target: "lazymc", "Using lobby method to occupy joining client");
 
+    // Must be ready to lobby
+    if must_still_probe(&config, &server).await {
+        warn!(target: "lazymc", "Client connected but lobby is not ready, using next join method, probing not completed");
+        return Ok(MethodResult::Continue(inbound));
+    }
+
     // Start lobby
     lobby::serve(client, client_info, inbound, config, server, inbound_queue).await?;
 
@@ -28,3 +34,13 @@ pub async fn occupy(
 
     Ok(MethodResult::Consumed)
 }
+
+/// Check whether we still have to probe before we can use the lobby.
+async fn must_still_probe(config: &Config, server: &Server) -> bool {
+    must_probe(config) && server.probed_join_game.lock().await.is_none()
+}
+
+/// Check whether we must have probed data.
+fn must_probe(config: &Config) -> bool {
+    config.server.forge
+}