Quite dismal that this has still not been fixed since 2015… the fairly annoying workaround is to do a GREP search for hyphenated words:
\w+(-\w+)+
for replace, set the style to Advanced Character Formats / [No language] (I do it as an override, as I don’t want it to interfere with my character styles). Or at least that worked on the version I was using previously. I have a feeling it’s a hunspell issue. It’s a bit of a drag doing it for every book, but I guess you can script it if you can be bothered.
– Alex