See the two bugs related to this issue that I created: https://bugs.kde.org/show_bug.cgi?id=394620 https://bugs.freedesktop.org/show_bug.cgi?id=23108 PDFs with annotations generated from poppler are NOT usable on other PDF readers. I think this bug is actually dangerous as users work with a PDF only to realize (possibly years later) that their data is missing. There was a patch in the above bug from 9 years ago but it's unclear if it was merged.
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