Photos: Cannot Start Editing. Photos cannot load adjustments for this image.
A bunch of photos, seemingly random, taken with different iPhones and my Nikon camera, suddenly displays the error:
"Cannot Start Editing
Photos cannot load adjustments for this image."
I have already run Photos Repair Library. The photos are in the library, not externally referenced. They have always been in the library. They are not imported from Aperture. I have been able to edit them in previous MacOS versions (now running 11.5 Big Sur). I've restored my MacBook Pro from backup.
I've tried Export Unmodified Original, then re-importing. I then get the error message:
"Cannot Import Item
This item cannot be added to your Photo library because it may be an unrecognizable file format or the file may not contain valid data.
Duplicate burst photos are not supported"
It is not a burst photo. Preview app opens the image just fine. The only way I got it to work is to use Preview app's Export, renaming the file, then importing that file back into Photos app. This unacceptable for the number of images that suddenly appear to be corrupted, and using Preview's Export this way reduces JPG image quality.
The library contains 12,000 images. I've done editing on thousands of these photos. How screwed am I?
MacBook Pro with Touch Bar