The resource rocks that are not falling with gravity. I have paid closer attention to them and I noticed that when the rocks are first released they seem to fall with gravity, but if they land on the parent rock, gravity checking stops. When I continue to dill the parent rock, those previously released rocks that fell are not checking for gravity again and thus are not falling, which leaves them floating in the air. I hope that is better information on this bug, to help you track it down and squash it. Flaoting rocks are extremely hard to get and I have to rely on the green crosshair of the rover arm tool to know where to work because visually they are not easily targeted.
0.0197717