So i am using a worldpainter of minecraft, to create a minecraft world, when i export to 1.12.2 the world works fine on 1.12.2, but when i run a server above 1.12.2 the world just seems to not work, it is stuck on ''Saving World''. Same is when i try to export the world. IF i export the world in 1.15.2 it will be still stuck on Saving world. However today i noticed others can play the map on the version 1.16.5 it is only i who is not able to join.