In the new snapshot 20w13a, my character has been duplicated. I’m stuck inside him, and can’t move myself. I tried to teleport myself out of him, and I found a “1c6f12c3-fe28-44ee-b5b4-27e7ffb8d841” pop up. I teleported to that one, and it was me, but I was there too. If you press F5, you can see my name tag.

I had exited the world to get my portal to fix, I had destroyed it, the portal didn’t shatter and there was some empty mass stopping me from moving. I exit the world, come back, and am greeted with another one of me, inside me.