Hi Michael,

Indeed, when you copy a native MoI rectangle to the PDF clipboard, all is fine, but try the one in the attached MoI file.

A parent layer is automatically created in Affinity Designer, but you'll have to select the child layer (the actual shape).

The rectangle in the attached MoI file was created by:

1: Unwrapping Isocurves from a solid using UnwrapCurve.
2: Using Sweep to create a surface from the unwrapped U and V curves.
3: Selecting the edges of the surface and using Join to create a new closed rectangle.