I'm currently working on a demo reel and and copying original footage from a few old projects into a new project file sequence. I did this succesfully a few weeks ago though now I open the project to make some edits, and a few of the clips have completely changed color, and when I reimport them from the old project, the same issue happens. This same issue has persisted ocassionally over the past couple years and I'm not sure if Adobe has addresssed it.
The first pic below is how it should look, and the below image is how it's appearing in the new sequence. The lumetri settings are exactly the same.