#session-lifecycle

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.

Quit-to-menu tears the game scene down inside Networking.DisconnectScope, so networking is still active during game-side teardown. A local quit is distinguishable from a host disband, and teardown code can still send graceful goodbyes.

The C# layer of s&box never closes per-pair Steam P2P sessions, so a host crash or task-kill poisons the pairwise transport state between two SteamIDs until Steam-side expiry clears it, typically minutes.