When I updated my creative world from 20w12a to 20w13a nothing was wrong. The bug began once I died. When I died my player could not place blocks or use the nether portal. I exited and opened the world to try fix the bug but I died as soon as the world loaded. Then I respawned all I could see was the inside of my players head. I could not move. I tried using /kill to fix this but it did not work. I loaded the world back into 20w12a and the bug stopped.