Even though the image is saved to your personal iCloud Photo Library, it appears to still be linked to the Messages app in iOS 15. Saving the image does not persist through the deletion of the thread and an iCloud backup.source https://timesofindia.indiatimes.com/gadgets-news/this-bug-in-ios-15-may-cause-saved-photos-to-be-deleted/articleshow/86640691.cms
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