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As they say in "I, robot" - your logic is undeniable...
The longer focal length and associated plate scale just make the "error" more obvious - sort of "in your face".
With shorter focal lengths it gets "lost" and not so obvious.
(The results actually depend on how the tracking error accumulates on the image- it may loop back and forth or sit more accurately during one part of the worm cycle the quick "jump" to an extreme. These changes in object/ star recorded intensity can dramatically change the look of the image....)
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