In my sitepage library some entries have strange book symbols. What do they mean? This is the first time I've seen this.
Apparently, it's a new thing.
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The book icon in Site Pages library shows that "The page has changes that are not published yet".
It will indicate that the changes were made to the page and Publish to update changes.
Read more information at:
Management and lifecycle of a SharePoint modern page - Check Publishing from the Pages library section on this page.
This will also work even if the content approval is enabled for Site Pages library.