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ImageIO encoding to HEICS fails in macOS 15.5.
log
writeImageAtIndex:1246: *** CMPhotoCompressionSessionAddImageToSequence: err = kCMPhotoError_UnsupportedOperation [-16994] (codec: 'hvc1')
seems to be related with
https://github.com/SDWebImage/SDWebImage/issues/3732
affected version iOS 18.4 (sim and device), macOS 15.5
unaffected version iOS 18.3 (sim and device), macOS 15.3
Do you have a small example project and file that this reproduces with? Attaching that to a Feedback would be helpful in tracking down what the issue is that you're encountering. Additionally it'd be good to know if the same issue reproduces on the developer beta of macOS/iOS 26.