Bug/Issue Blinking/Flashing dust when discovering a fossil.

I've been trying to discover some fossils these days, and while doing so, I have noticed that when I try to remove the dust on top of the fossils, it blinks. It's not something that makes it impossible to discover the fossil, but it's just not right.

I'm using Ubuntu 16.10, playing the game trought Steam.

Here's a video of what happens, recorded by me:

On camera I caught it only one time, but I swear that it has already hapenned simultaneously at the entire grid.

 

Watch 0 : 34 ~ 0 : 36 with playback speed set to 0.25 to notice the texture changing.