Relink Clips Issue in 10.6.2

10.6.2/12.3.1 on an M1 Max MBP- I'm working in a project that I've been cutting for a few years and suddenly when I open it up a bunch of the files read that they're offline. So I go through the relink process and it tells me it finds the files fine, but when the relink window closes they still show as offline. I can't reimport from Camera Archive either.
Any thoughts?

Are you sure the clips are offline? If they appear to relink, it's more likely that you've got a plugin / effect missing or broken.

Select one of the 'offline' clips in the timeline and check the Inspector's Video tab - uncheck the master Effects box and see what happens.

EDIT: Could also be a missing LUT, which you'd find in the Inspector's Info tab for the selected clip.