Weird display on rational surface

Is this normal? The red polygons show up even when it’s joined to its original polysurface object I extracted it from (it’s a fillet from a different CAD package imported into Rhino).

refittrim.3dm (50.4 KB)

(I named the file refittrim, because I first tried that to fix it and it failed, but shrinktrimmed worked well.)

It just a poorly calculated render mesh.
Run ClearAllMeshes and go back to a Shaded display.

image

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