Yes, I have built about ten wheels with X717's (Disc & Ceramics). Nearly all of them have a flat spot on the outer diameter. I think that Mavic sands the rims a bit at that point after the welding is done (and before the anodising).
On some occasions I even have to apply a bit lower spoke tension at the four spokes around the weld to make the wheel completely true (apart from the flat-sanded spot which is around an inch wide).
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