Thinking more about this, it might in fact not be a bug, but working as intended. As the Debug View Hierarchy is focused on the hierarchy (no surprise there), it is more useful to show the actual bounds of each view, rather than exactly matching the final app display. Showing stuff a view draws outside its bounds might only make things confusing.

Am I correct to assume that the new NSCoreDataCoreSpotlightDelegate stuff is for iOS only? I've tried using it on macOS but can't get it to work. For example, contrary to the documentation, Xcode claims that NSCoreDataCoreSpotlightDelegate has no method named startSpotlightIndexing.