Tile has weird texture when sand droped into plan

Having similar from time to time, but with me it was always relative to pressure plate and liquid.

I also remember this bug to be there on following plates (even it's not the case in the screenshot)

This has been around for a long time. I think it may be a graphical/rendering issue?

I'm on the current test build now (CS-440073) and it's still here:

Before mining out the block below sand:

And after:

Note also how the air seems to stop around it the graphics seems to render it as if it were vacuum. Also, any items that were where the sand fell still show even though they should convert to "buried objects".