Honestly this issue has been annoying and doesn't seem like it's gonna get fixed soon..
me and my friends have been using a service called ZeroTier https://www.zerotier.com
that completely fixes the problem, I'd recommend using it as opposed to waiting.
Hope it helps.
ATTENTION!!! FOR PEOPLE PLAYING MAC/WINDOWS MULTIPLAYER TOGETHER THIS IS A FIX FOR THE NEW STEAM UPDATE THAT WASNT ALLOWING PEOPLE TO USE STEAM OR INVITE CODES!!!!!!!!!!!!!!!