Emulator

Game Name?
Any game.

What's the problem? Describe what went wrong in few words.
When my brother connects to my netplay server and I start a game, he gets a "Game not found!" error before it starts on his end, before dolphin launches the last game he played on his end. Both of us have the same exact copy of the game that we're trying to play. We think this is causing desync.

What did you expect to happen instead?
For the error not to appear.

What steps will reproduce the problem?

1. Host a netplay server
2. Have someone join
3. Start any game

Which versions of Dolphin did you test on?
4.0-4175, 4.0-4231, 4.0-4250, and other earlier versions.

Does using an older version of Dolphin solve your issue? If yes, which
versions of Dolphin used to work?
No.

What are your PC specifications? (including, but not limited to: Operating
System, CPU and GPU)
https://docs.google.com/document/d/1AaErKm7-UxJ0pPLS0ief4P9NuP48yj1RcEOvCsfdblg/edit?usp=sharing

Is there any other relevant information? (e.g. logs, screenshots,
configuration files)
None that I know of.