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"Photos cannot load adjustments for this image" error since upgrading to Catalina

Steps to reproduce:


* Migrate large photos library from Photos Mojave to Photos Catalina (in my case 120,000+ photos migrated using migration tool and time machine backup).


* A subset of photos (in my case 10,000+ photos from 2016/2017) cannot be edited: when you click on the edit button you get "Cannot start editing: Photos cannot load adjustments for this image"


* Hypothesis: it is likely that the affected photos where previously edited with Aperture and/or earlier versions of iPhoto.


* This the exact same problem as reported in "https://discussions.apple.com/thread/251602029 (That thread was closed due to lack of activity and cannot be re-opened)


* I have already tried all of the following: repair library, boot in safe mode. Nothing helped.


* The same subset of photos can also not be exported anymore; see https://discussions.apple.com/thread/251602029


* Already spent several hours on the phone with Apple tech support but to no avail (case is open).

MacBook, macOS 10.14

Posted on Aug 10, 2020 8:24 AM

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"Photos cannot load adjustments for this image" error since upgrading to Catalina

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