Issue with the transformation of a parametric shape
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I start with a rectangle. I change its shape with the shape editor tool. I duplicate it and apply a blending. When I want to modify the shape, I get an artefact at one of the extremities (lower left). A bug?

Issue:

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@Pat It could be a smooth / cusp node flipping its state.
Send me the example, and I will try to figure it out.
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@VectorStyler The file is sent.
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@VectorStyler as additional information, this issue appears only for certain positions of the curves:


