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Ok, so I've figure out why. I don't know how to solve it yet.

The why is that the distortion causes the corners of the image to wrap around, making actual negative size ROIs, which get turned into all zeros.

If you manually alter the camera matrix and undistort, (say by multiplying the focal lengths by 0.2), you can see this:

So I would file a bug report showing the problem, and see where it goes. I'll think a bit and see if I figure out a better way than it's being done now. It's rather crude, inside, so there probably is.