So I made my way to the end. I saved the game and backed up that savestate (so if I fall into the void I can reload that savestate and get to keep all my enchanted diamond things) amd right after saving, I died. When I click respawn, I can see myself in a void (like the one you see if you fall out of a superflat world, just without anything on top) and I can't move, eat or hit. my character still moves its head though. If I go into spectator mode I can move around, there just arent any blocks anywhere. The coordinates it shows me are the ones right next to the bed where I'm supposed to respawn. If I reload the old savestate and evade my death, kill the dragon and exit through the portal, the same thing happens. In the end I can move around normally and everything seems normal.