This glitch doesn’t happen 100% of the time but it happens sometimes.  So what happens is that when I’m in the nether and I go through the portal to leave the nether, I get stuck in the “generating world” screen.  I’ve waited a few minutes but nothing ever happens so then I have to restart the game, forcing my friends to disconnect from the world, and then start the world up again.  It also happens to my friends when we play.