Error on Save : "Indesign is unable to save this file. We tried, but appears to be damaged."

Just started happening with v18.5. And only with very specific files? Have a fairly simple file that I drop PDFs into. If the PDF's on the page that generates the thumbnail it'll fail. If you then resave over the same filename it'll save happily. Doesn't happen if you start from a new file, or from other more complicated files but is very replicable.

Have tried clearing preferences.

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