In flight-deck demo not all planes can be highlighted in editor

When selecting plane nodes in the hierarchy panel. Some planes will not highlight in the scene. Perhaps they've been removed from the scene but that hasn't propagated to the editor?

Start by reproducing the issue in the flight-deck demo: select each plane node in the hierarchy panel and compare its highlight state in the scene. Trace how hierarchy selections and scene removals reach the editor; done means every existing plane highlights consistently and removed planes no longer leave stale hierarchy entries.

Written by the indexing model from the issue text.