Post Published PVZ object won't display components that were visible in source representation

Our Windchill system creates a Default rep, a Post Publish rep, and a PVZ Publication Graphic using a PostPublish Delegate. But there are several parts in the resulting PVZ Publication Graphic that will not display, although they show up in both the Default and Post Publish rep of the source assembly.

The problem components do happen to be models that were imported into Creo Parametric, but I would expect the same behavior for all outputs, not just the Publication Graphic.

Everything was created at the same time and viewed in Creo View with the same settings, so I can’t figure out why there would be any difference in that one PVZ versus the other two.