When I create a single player world and launch it says "connection lost internal exception: java.nio.channels.ClosedChannelException" and puts me in the multiplayer server list.

I am playing 3.0.8 through the twitch app. idk what other information you need but just let me know.

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ClosedChannelException is sometimes related to the read timeout, check this:

https://github.com/DarkPacks/SevTech-Ages/wiki/Read-Timeout-Exception