Gray "Video" box when editing SL

After some testing on my end, it seems like the issue occurs when the video has been edited by Clipchamp, the Microsoft video editor. I created a test file - I uploaded an older video that was edited in a different software (I'm not sure which, possibly Adobe Premier Pro) into the first slide. That one appears as expected. I then edited that video with Clipchamp (all I did was clip it shorter) and saved the edited video. I uploaded it to the second slide and the gray box issue happens. It plays fine, it previews fine, I just can't see it when it is paused/stopped on the editing stage. Both files are mp4.

To answer the questions from the post:

I have the most current version of SL installed (3.127.38181.0)

It happens with multiple projects, but not all of my projects. When I open older projects, the videos display as expected. These videos were edited in other applications, mostly Adobe Premier Pro. When I open more recent projects, specifically those with videos edited in Clipchamp, the Gray Box issue occurs. This was NOT an issue when the project was created in May - the Clipchamp edited videos displayed as expected on the stage. Only now when I open those projects they no longer display as expected.

And the new "test" project file I created shows the first slide with the video displaying as expected, and the second slide with the same video edited in Clipchamp displaying as a Gray Box.

I do not want to post a project publicly due to employer privacy concerns, so I have submitted a support case with this information to get more help.