I cannot connect to anyone on R2B4. I think this is a syncing issue with me specifically, and what makes it weirder is that this issue is only in R2B4. We can get in game in other levels, but if a friend hosts R2B4, I will descend until I get booted. And if I host instead, all three of them will descend until they get booted.
This is what it looks like. We load into the docking machine, we start descending, and somewhere midway the background scenery turns black to when everybody else loads in. Then there is descending purgatory. After a while of exploring the map, instead of being put into loading purgatory you would just be booted from the lobby automatically instead.
Here is some stuff I tried already. I can connect to other players on other steam games just fine. I am able to enter the map in GTFO on my own. We can enter every map we have unlocked just fine, it's currently just R2B4. I've already tried verifying my files and playing on a fresh computer restart. I've already tried redownloading the game. I've also lowered my graphics to the absolute lowest they can go. My FPS usually stays at a consistent 60FPS while playing but descending gets it to 20.
I do not know why the map is cursed, but it's JUST R2B4. No idea, would love any input.