If I use “File…export” to export the project, the problem persists in the resulting file.
I made an example file using “collect and copy to new location” from the project manager and the issue remained.
But, using “consolidate and transcode”, the resulting new project did not exhibit the issue.
Further, using Quicktime to make a new trimmed file from the source resulted in a file that, when imported into the project, did not exhibit the problem.
However, several clips on the timeline do have the problem, and I see the issue in another project, this one in the latest beta of Premiere.
So, it don’t think the issue is in the project file, but, perhaps, in how Premiere (and Continuum) treat these Ninja V files—just guessing.
If I take an MP4 produced by Premiere, and place it on the timeline, I don’t see any issues, but I do with the Ninja’s MOV files.