For years I've been annoyed b/c when I import .docx files into LibreOffice, all the bullet points (•) in unordered lists change to movie clapperboards (🎬). Not a huge deal—you can fix it manually. But if you want to batch-convert a bunch of documents with unoconv, you're out of luck. I finally figured out that I had an out-of-date version of Microsoft's symbol.ttf, and when I updated it the problem went away.
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