Sand landing on snow slabs is inconsistent.

If you drop sand on stacks of snow slabs with different thickneses, it sometimes destroys the stack, and sometimes lands on top of it. This even varies if you relog while the sand is falling.

Steps to Reproduce are not required. Just experiment with different stack/slab heights. Also experiment what happens if you relog, and what happens if you don't.
You have 14 combinations.