LAN servers now have 4 digit ports when before they would have 5. It also gives the error
"io.netty.channel.AbstractChannel$AnnotatedConnectException : Connection timed out: no further information:" When someone using your same internet tries to join.
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Can you please check if you have a crash report in your game profile ?
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According to this website. This could either be caused by an outdated Java version, your firewall, or incompatible software with Minecraft.
violine1101
Thank you for your report!
We're actually already tracking this issue in MC-120362, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. Depending on the resolution, that can mean that it either will be fixed in the next version, or that it is not considered a bug and won't be fixed.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.