No bfseries for Palatino nova Pro with luaLaTeX

Description

\bfseries appears not to be correctly defined for Palatino nova Pro when using LuaLaTeX, while it is when using XeLaTeX.

Check/indicate

[ ] Relevant for XeTeX
[x] Relevant for LuaTeX
[x] Issue tracker has been searched for similar issues?
[ ] Links to discussion if appropriate

Minimal example demonstrating the issue

When I process this document

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Palatino nova Pro}
\begin{document}
{\mdseries mdseries}
{\bfseries bfseries}
\end{document}

with XeLaTeX, I get as expected the following result:

However, when I process it with LuaLaTeX, I get

As far as I can tell, this problem is specific to this font; for example it does not happen with Times New Roman. I searched the fontspec documentation for a possibly relevant difference between Xe & Lua, but didn't find anything.

Further details

I'm using TeX Live as included in Debian 10.2, i.e. 2018.20190227-2. According to the log, this means LuaTeX 1.07.0 and fontspec 2.7b.

My installation of Palatino nova Pro includes

PalatinoNovaPro-Regular.otf
PalatinoNovaPro-Italic.otf
PalatinoNovaPro-Medium.otf
PalatinoNovaPro-MediumIt.otf

from version 1, 2009.

Sorry, this is a font/engine issue not a fontspec issue (see luaotfload). Generally for complex faces the heuristics have trouble detecting. FWIW on my machine right now I get something even more nonsensical from your minimal example — for mdseries it's titling and for bfseries it's one of the darker bolds.

For complex setups I strongly recommend making your own palatino-nova.fontspec file with contents like this:

\defaultfontfeatures[palatino-nova]{
  Extension   = .otf ,
  UprightFont = PalatinoNovaPro-Regular ,
  ItalicFont  = PalatinoNovaPro-Italic ,
  BoldFont    = PalatinoNovaPro-Medium   ,
  BoldItalicFont = PalatinoNovaPro-MediumIt ,
}

Then you just write \setmainfont{palatino-nova} and you can fine-tune the font shapes in the family as per your tastes.

latex3 / fontspec