Premiere Pro 2020 - Stutter and Incorrect Clipping Render. Maybe VRF Related?

More comprehensive thread --> Adobe Support Community - iPhone 11 pro x xs 4k 60fps hvec 

Premiere Pro 2020, stuttering on iPhone clips (assume others but that is what I'm using).  Clips appear to overlap themselves inconsistantly.  After trimming a clip and moving the clip into the correct spot in the timeline, the clip that appears in the out render is not the same as the trimmed clip.  

If a clip goes A-B-C and I trim to just the C, after moving the clip shows as A or B.  As well the clip stutters heavily at times.  This appears inconsistant, as when I opened a screen recording app to capture the behavior it cleared.  Going through current forums this may be related to Variable Frame Rate.  However the prior posts indicate a sound de-sync.  In this case I have footage that jumps back to prior frames from within the same clip.

Feels like a compatibility issue or defect.  I am using the same source (iphone) and performing same actions in 2019 did not have this issue previously.  Post 2020 updates for encoder and an update (14 days ago) on 2019, I now have this issue on any files that appear to VRF (Variable Frame Rate)

I am trying to capture a video of it but not having success.