So i found this bug tonight (9:30pm AWST May 27th) I'm not sure how long it's been affecting my world.

I was able to rename a name tag earlier in the game but after killing to ender dragon I've been experiencing alot of issues.

I can't rename anything in an anvil, I've searched this forum for fixes but they didn't work. When i try to rename something it return back to the first box and its name reverts to normal. 

I've made a copy of the world and tried in single player and i could rename items, i tried in a different world and I could rename items but it is only with this realm that I've encountered this problem. 

Also when changing difficulty, my hud completely disappeared and after i killed the dragon i died and then shortly after I respawned i had all my xp back.

I tried killing myself and getting rid of all my xp but that didn't work either, it is also effecting the other people who play on the realm