It's in the model. This is with Top Layer Only displayed in the Cura preview. I would have to say that Cura is "faithfully reproducing" the model. You can see that this artifact appears on layer 266 but the real clue is on layer 262 where Cura leaves a hole in the surface for when this artifact shows up.
There is another area like this at the back of the model but that 2nd area is inset into the surface. I have it high-lighted in the PrusaSlicer screenshot.
Sketchup is notorious for leaving artifacts and for surfaces facing the wrong way. This model is complicated and you did a nice job putting it together and there aren't many errors. If you view it in "X-Ray View" you will see one. The error doesn't seem to have anything to do with this area though. These modeling errors should be easy to fix in SketchUp.
This is the same model (after repair) sliced in PrusaSlicer.
That one looks like it's on a separate layer. Could it be something left over or deleted when you were still in the CAD software?
Use "File | Save Project" and post the 3mf file.
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