"65 or more items" means 65 or more items in the same stack.
My pack works properly with the stack size of 64, so it looks like stack sizes of 65 is not permitted and freeze the world.
RedBridge418275
"65 or more items" means 65 or more items in the same stack.
My pack works properly with the stack size of 64, so it looks like stack sizes of 65 is not permitted and freeze the world.