Falling sand/gravel will disappears and floats above snow

Sometimes when you try to place sand/gravel in place that will cause it to fall with the new gravity mechanics it will disappear and not be placed or fall. The sand/gravel will also be used out of your inventory.

Also if you remove a block of sand/gravel at the bottom of a column of sand/gravel the whole column of sand/gravel above it disappears as well.

Update:

If sand/gravel falls on sand/gravel it will disappear, if it falls on other blocks like dirt it won't disappear.

Also if it falls on snow it will float there. Attached picture of this.

Update 2:

Ignore comments about only disappear on sand/gravel tried this again and its disappearing on most blocks now.