`GumpSystem` clears a connection's gumps on `EventSink.Disconnected`, but `Mobile.NetState` raises it after the state is already null, so nothing is ever removed: every connection that touched a gump stays in `_gumps` until restart, with any gumps still open when it closed.
It now listens to `BeforeDisconnected`, while `m.NetState` still returns the connection. That event also fires on login, where there is no previous state and the handler does nothing.
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