Invisible rock in Medulla Mesa?

#1 It gets really annoying sometime when you're on a scrum run or desperately heading for that health powerup. It's a flaw of some sort that hopefully will be fixed. I've also noticed that it doesn't always seem to be there...

#2 Its called "InvisiRock" anyhoo.

#3 I thought it was InvisoRock. and anyway it can be useful if you know its exact location. I do but i manage to hit it in the end anyway

#4 I think there is a rock just under the soil there.

#5 I have run into the behavior several times. Invariably, it's after a collision between my tank and another where we get stuck briefly. After we manage to separate, my tank behaves as if the other tank were still there, and I cannot go through that spot. I have to go around it. Once I do that, I'm fine. I've never come back later in the game and run into it again (although that could just be luck).