i was testing a world with the changed world height from -512 to 511, if the player moved at all the game crashed with no crash report and exit code 1, the report only had my computers specs and the version it was running on. i know its probably not meant to run with this world height but i think if it were to run decently enough and it ran well enough to work on in 21w05b that you could "play" on it not dipping below 30 fps for me a lot of cool maps could be made from it.

in the datapack file, the miny = -512 and the height=1024

After doing some more testing i am unable to create the bug on the same world same datapack