OpenStreetMap's definition of Beaverton is quite complicated: https://www.openstreetmap.org/relation/423111 It includes several cut-outs for neighborhoods (including Cedar Hills) and other features. I'd guess that the OSM mappers were trying to represent a particular legal definition of the Beaverton city limits. How accurate it is, I wouldn't know.

Perhaps in situations like this, "City Roads" might consider ignoring the cut-out enclaves and just using the mulipolygon's outer boundaries.

The power line showing up as a road is a mystery. If you can locate the corresponding feature on OSM you might want to investigate it. (There may in fact be a road or trail of some sort, though -- it's common for powerlines to have a track for maintenance vehicles.)