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Looking at a single font file (e.g. of Candara) with InsideFont indeed doesn't show these glyphs. I still wonder, how other applications can display them

This is most certainly a font issue as not many fonts contain these characters and what you are describing looks like the replacement mechanism. Open Insert | Symbol and verify that these characters are really part of the specific font you use. They are not in the symbol list, but, as mentioned, th...

The same e.g. also happens with ⚠ (U+26A0)

Hi, I'd like to use enclosed alphanumerics (see http://www.alanwood.net/unicode/enclosed_alphanumerics.html) in one of my documents. However when copy-pasting the characters from the website, they are not displayed at all and inserting them using the Ctrl-Alt-Shift-X (as described in the manual on p...