At character select the IO thread waited only on the app's requests, so a server that dropped the link (vmangos kicks a session idle there after `CharacterScreenMaxIdleTime`) went unnoticed until Enter World started a load.
1.12.1 keeps servicing the connection on that screen, and a drop runs `CGlueMgr::NetDisconnectHandler` (`0x46c540`): `DISCONNECTED_FROM_SERVER` and back to login.
The park now looks at the socket twice a second without blocking. A closed link ends the session as a failed roster ask does; a packet sent unasked is read and handled as `char_enum` handles its strays, in one shared step.
A fake-server test drops the link while the client is parked with no request pending and expects the session lost; it times out without the change.
Fixes#1020🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Sam Sung
7063549659