Shape builder not working consistently for the same shape after being moved
I have a perfect tangent (generated by code) that will work in the top part of the attached file. The bottom part will not work for the shape builder tool.
Reflecting the shape or moving it might fix one or both of the bits, and allow them to be "shape built". It might also break the possibility of "shape building".
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Magnus, I can confirm this also happens for me when I try your file.
Well, Illustrator is not a CAD program, unfortunately. It’s based on an internal grid, and you were lucky to find a weak spot when rounding coordinates makes AI think the tangent is not perfect.
To workaround this, open the tool’s options and set a gap detection to a very small value — it worked for me.