the rects and how to treat them seem to cause some skub:
https://1d6chan.miraheze.org/wiki/Skub
I think the main cause (of manually done ones) is when they end on some external geometry (like partial/rotated cylos) or at intersections...
if these have bad/odd/unnecessary decimals, rectifying it can worsen things.
(because a rect is at half of the distance, if this is odd, the result will have one decimal more...)
https://1d6chan.miraheze.org/wiki/Skub
I think the main cause (of manually done ones) is when they end on some external geometry (like partial/rotated cylos) or at intersections...
if these have bad/odd/unnecessary decimals, rectifying it can worsen things.
(because a rect is at half of the distance, if this is odd, the result will have one decimal more...)