#wrong-behavior

Networking.CreateLobby is async — Networking.IsActive is still false on the same frame, so any branch on IsActive takes the wrong path. Gate on your own synchronous mode enum instead.

A [Sync(SyncFlags.FromHost)] field on a runtime-created singleton never replicates — the object needs NetworkSpawn, not just NetworkMode.Snapshot.

A joining client's static join state (invite code, mode, attempt ID) gets wiped by the networked scene handoff — the bootstrap's OnEnabled resets statics before the join handshake uses them.

On the host, spawning a joiner's character clobbers the host's own camera-target singleton because IsProxy is false at Components.Create time — re-resolve the claim at the first OnFixedUpdate.