In order to replicate:
Join solo world
Walk around a bit
Leave solo world
Attempt to join a server
This eventually fixes itself given time but whenever I try to join a server after doing the above steps I get the "unable to connect to world" error.
Comments 2
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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By server do you mean a Featured Server (Hive, Cubecraft) or a multiplayer game such as Realms?