Black multicam angles in Final Cut Pro X

I'm hoping for some insight into why one of our interviews multicam angles are black. I opened the library today and both of the camera angles from one interview are black. Black in the browser and angle editor. No apparent issues with the files in the finder.

All the other interview multcams are fine.

This is an ongoing project that I haven't had any issues with.

We frequently use multicams for interviews without issue. Bit of a mystery. Any insights are appreciated.