The redstone hook has an infinite-range creative flight exploit. When multiple hooks at the same coordinate, the polyhedral collision mesh formed by hook connection points may occasionally vanish. This disables the limitation, enabling unrestricted creative flight (within the same dimension).
To reproduce: Without moving the mouse, two or more hooks can be fired to the same location. When firing hooks randomly, if you intentionally overlap some hooks, collision mesh may occasionally disappear.
This save reproduces the bug:
test.zip

We use this mod on our server, and this exploit has become a huge issue. Many players know how to set it up in less than a second, allowing infinite flight in a large range with no consequence, as well as no fall damage.

Looks like it has something to do with the angle math used to make the bounding box, since it only happens when making very flat bounding boxes or very stretched bounding boxes. Easiest way to set it up is to make a tetrohedron with one vertex much further than the rest.

I've had a difficult time reproducing the issue, but since it seems more widespread I'll take another look at it.

I've had a difficult time reproducing the issue,

Here, I have a setup that always works. Occasionally I have to throw another hook at the triangle.

Fixed in v2.0.2