AIR 20.0.0.233 is losing some Sprite objects from the display list...

Users installing AIR 20.0.0.233 are reporting that some graphic sprite objects are not being displayed.  Downgrading to v19 fixes the problem.  Other installations with 20.0.0.204 also do not show the problem.  Something happened between .204 and .233 that is causing a pretty big problem for our app.