As of this week, it was noticed that Lan connection were unable to be established while playing 1.21. Computers have been reset, we confirmed they were on the same wifi channel, we upgraded our wifi router, and looked into our trust certificates. 

What I expected to happen was...:
After opening to LAN on my PC, the other computer should have recognized it per normal

What actually happened was...:
Searching for LAN/server

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
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