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I'm no expert, but quite a few photos in my LR catalog now say they cannot be found but when I go to "Show In Finder" every single photo I've revied is in the same original location.
I've done Library-> Find All Missing Photos with no success, it just seems liek LR is not seeing the photos in the original source whatsoever.
It really doesn't matter if you did anything or not, the important point is that Lightroom Classic thinks the files aren't there. So you need to follow the instructions from @GoldingD and fix this.