Grabber sometimes won't release

[NDXON]

I have been experimenting with building a walker with grabber feet, to climb up and down cliffs. I wanted to test this out on the "Misty Mountain" sandbox, only to find that once my grabbers had grabbed the mountain, they wouldn't release no matter what!

To replicate:
- Go to Misty Mountain
- On the starting block, put a grabber on the bottom and toggle on "Grab Static". Put a flying block on top.
- Start the simulation. The block will grab the ground, but pressing V won't cause it to release.
- Switch to either of the other sandboxes; the grabber will now release as expected.