Dupes can't dig regolith with buried object?

i have seen that bug fairly often, but usually as the 2nd from bottom tile, my guess is it has something to do with the random refined carbon you get up there and that regolith dropping at the same time. but i have not been able to confirm it.

also, if there is a tile under you can dig, you can just dig that one and it usually fixes itself. it will fix itself also if you reload the save.

Edited September 7, 2018 by Xadhoom