One further detail: In a book that has this problem, if I highlight something (with or without adding a note) and then close the book and re-open it, the annotation has disappeared - i.e. in addition to not showing up if you click the "Annotations" icon, it no longer appears as highlighting on the page...
BUT - even after that, when everything seems to have disappeared - if I fetch annotations into Calibre from the device, the "disappeared" annotations are uploaded successfully! So, they're still "there" in some form, I guess...
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