Infinite loading or streaming when joining P2P multiplayer server

Since July 1st me and 3 friends have been unable to successfully load each other's multiplayer worlds. We can join the session but are repeatedly trapped at either 50% or 100% loaded until the game is force exited. If we do load in, we can get as far as the respawn screen and can see the possible spawn locations, however choosing to respawn at one will result in an infinitely rotating streaming icon. The host can see the players spawning in T-pose but they never have control of the characters. If these players leave and successfully rejoin they see a completely empty void, no textures or models. Single player worlds and official servers work normally for everyone. We all run the game through Steam.

We have all tried:

- disabling all mods

- loading previously working copies of our world

- loading a vanilla default world(red platform & star system)

- deleting the space_engineers.cfg files

- deleting the shader cache folder

- verifying integrity of game files

- fully deleting and reinstalling the game, including deleting all files/folders missed by steam uninstall

- 3 different players hosting in 2 different steam download regions

- all players restarting steam and space engineers in every order and configuration possible

- updating all drivers

- probably a couple other things that I'm forgetting

The issue did not happen all at once. One friend had the issue, while the other 2 could join. After restarting Steam, the second player was unable to join. A month later(the next time we tested) the third player could not join.

It really looks like you have some sort of issue with Steam peer to peer connections that popped up around the start of July, you'll see several other reports on Reddit around then of exactly this issue. I attached the log files for myself(HappyMonk3y99) and my friend Sargent_X which show both the host and client side logs. We have a 3 hour time difference so you'll see the overlap around 23:22:XX for Sargent_X and 20:22:XX for me.

If you have any more ideas for troubleshooting I'd be happy to try but I think this is on your/Steam's end.