it also affects a few other weapons, most notably the wrap assassin, and it doesn't necessarily happen on ramps, just where bounding boxes are larger than they realistically should be
the most hilarious i think is the fact that the explosion on badwater has its own massive physical bounding box for when the cart gets pushed all the way, and it covers basically the entire last rendering the wrap assassin entirely inoperable in that area
but you'd know this if you actually watched the video