The preview dimensions are wrong if an image manual crop field is within an unopened field group, say a vertical tab group that is closed on the initial load of the node edit page.
This seems like a JS error, 'cause when you open the crop dialog and close it again the preview updates correctly.

CommentFileSizeAuthor
After having opened and closed the crop dialog.png292.41 KBsupermoos
Before opening.png3.8 MBsupermoos

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supermoos created an issue.