Bridge CS6 thumbnail preview issue on some .QT files

I am using CS6 Bridge (5.0.2.4) on Mac OS X (10.14.3).  I have a master folder with sub-folders that have only photos and others that only have videos.  I use Bridge for its "Batch Rename" tool.  Recently, I have noticed a folder that has five video (.MOV) files is only displaying thumbnails for two of the five videos.  All videos were taken on the same iPhone 7.  All videos are transferred from iPhone to "Photos" on OS X using USB cable.  I then drag and drop from "Photos" to specific previously mentioned folder structure on Mac desktop.  I have zapped the PRAM.  I have deleted the plist.  I have deleted cache on "hidden" Adobe library.  I have also tried the Bridge - Tools - Cache menu options of "Build and Export Cache" as well as "Purge Cache For Folder" and re-launched Bridge.  Sadly, all attempts have not resolved my issue.  I am aware most people are on CC Bridge and standalone version CS6 is antiquated, but any help would be appreciated.  Thanks!

ps: Adobe Bridge Preferences File Type Associations QuickTime (.MOV) correctly shows QuickTime Player 10.5