Aslak Kjølås-Sæverud

I'm going to go out on a limb here, so might very well be wrong.
I think the reason we see a repeating pattern is because `Pixels per Step` is on, this limits how far it can distort in one go. So after each step it's going to sample the previous step instead of the input image.
This results in it sampling the previous distortion, making it sample in place over and over.

If you disable pixels per step it does allow it to jump to the "target", though if you want this it might be better to use uv/image sample to get specific parts of the image.

Made a little video where I blurred the direction a bit so you see how it's distorting, it made it easier for me to understand at least.

JasOnn
Or does it matter and I should just submit it anyway?

Do this

As far as I know they unbound the X snapping radial in H21, you can re-assign the shortcut in the radial menu editor (Edit/Radial Menus)