Tween weird asymmetric result

Hey all! I get this weird result when trying to tween these two curves (look at the asymmetric progression of the corners).
Algorithm attached. Thanks a lot for looking!

unaret stea (20.7 KB)

Fit your curves first with the FitCurve component. The issue is your filleted arc segments. Or use Pufferfish tweens which handles these cases.

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unaret stea (15.5 KB)

Your result should tween to a sharp geometry like @zoster image.