Upon updating to 1.20.5, we are unable to join a LAN server. It may be related to OpenJDK Platform. When the server is run on one computer, the other is completely unable to see the LAN server on the list of servers. When run on the other computer, the first can see the server, but fails to join with the error message: "getsockopt". The LAN server still functions perfectly when downgrading back to 1.20.4.

This is the same issue that those in this thread discuss:
https://www.minecraftforum.net/forums/support/java-edition-support/3199164-connection-timed-out-getsockopt