I'm working on a LuaLaTex project for which there are, as far as I know, only three appropriate fonts in existence, all of which I have to upload to use and all of which produce the issue I'm trying to deal with. But if I put together an MWE using a standard font, the issue doesn't crop up.
Is there a way to post a useful MWE on tex.stackexchange
referring to a specific, non-standard font?