>>> I do not think that my Times New Roman font is corrupted. > > Actually, I think it is: Most likely the font's 'post' table is > broken (i.e., it has a wrong PostScript name for glyph 'N'). > Normally, you won't see the problem at all because most applications > access a font's 'cmap' table (i.e., a Unicode input value gets > mapped to a glyph index), which seems to be OK for this font.
And indeed, I've found this thread https://discussions.apple.com/thread/254519584 which explains nicely the exact cause of your problem. Werner