It's actually good, because no matter what gravity u r in, it will switch to the other one. Example for how it could be useful: let's say there is a level with a ship part and halfway through there is a yellow gravity portal. At the end, there is a cube portal with a green portal. Ideally, you would flip back to normal gravity. But if you can find a way to skip the yellow gravity portal in the ship, you would touch the green portal and flip upside down into a coin path. More useful then you think.
