V13 - video clips no longer showing (transparent)

I have a project I started on V12 and was working fine.

I upgraded to V13, and some of my clips on the timeline of composites are now not visible. All of the other information (settings etc) is correct, but I just get the transparent checkerboard pattern. The sound is also gone, although the waveform is displayed on the timeline.

If I create a new composite from the media, they work OK. But I don't want to rebuild all of my composites in the project.
I have saved the project as a new file to force a rebuild. I have disabled hardware rendering. I have cleared teh cache. Nothing so far has fixed the issue.

It happens for some but not all clips. They are all from the same camera and have the same MP4 format.

Has anyone else experienced this or have a solution?

 

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