This issue was found running the content moderation module. As described in the title, if the option to show a thumbnail is set for a field in the diff module settings, it is shown no matter what in split view.
Changes however are detected correctly, as was observed by removing the option to show thumbnails. Then, the field is removed if no changes were made and added with the picture's source if there were.
Thumbnails should only be shown if changes have been made to the image field in question.
Active
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I added a configuration for image revision status and resolved the display issue of images in revision diff.
This code has changed significantly in the latest 2.x version of this module. Can you please try testing this against the 2.x dev release?