My friend set randomtickspeed to 100000000 and obviously the realm crashed.

so the owner of the realm downloaded the map, gave it to me via USB, i opened it in single player (via minecraft account of realm owner) to check if everything was good and if tickspeed was set to normal values (I spawned with his inventory). then i uploaded the map in his realm because his internet was too slow to do so. after logging in i spawned with his inventory and on his logout place.

also after relogging in with my own account i spawned with his inventory

 I also tried to delete my whole .minecraft folder to make sure there were no files left where eventually the inventory data was saved in but i still spawned with wrong stuff