arrested effect does not work it does and slow down

in hardcore mode I died and put the spectator then I laid open to lan and put enable cheats and then gave / gamemode 0 and reborn

I created a book and tried to read when opened was not buggy when I clicked to read he would go up and then returned

when I put two iron doors one next to each other and then put another on their side it was buggy was half invisible, and I could go inside

when I put fireballs in the ejector and she came out pink and Rock and after that hit me was leaving the new effect ender dragon when he throws a fireball