I can't regen ID and doing a local host/join doesn't work in any version (You've lost connection to the game)

for now just don't use the snapshot, it completely breaks multiplayer

Had the same issue with multiplayer, except I was hosting a server on the internet (put radbloxrevivalback.000webhostapp.com in the server browser for cool servers!!1!!1!11! ) and I was quite confused when I tried to join my server.