Just want to confirm that this is a bug (or I am retarded and am doing it wrong) before I head to the tracker.
With an animated sprite object, go to the animator panel and edit it's collision mask. Now, right click on it and pick "Copy Collision mask to each frame." Now check the collision mask on any frame. They have all been erased.
Just want a few others to confirm this before I make a wrong bug report and look like an idiot :D