Adobe Reader cannot extract embedded font New Computer Modern

Question

When I create a PDF using the newcomputermodern font and try to open it in Adobe Acrobat Reader DC, I get following error message, and some characters will not be displayed:

Cannot extract embedded font 'RDUBLY+NewCM10-Book'. Some characters may not display or print correctly.

The error persists whether I am compiling with LuaLaTeX or XeLaTeX, loading the newcomputermodern package or setting it as mainfont with fontspec; only the letters before '+NEWCM10-Book' change with some settings. In Adobe forums, some people raise similar issues related to an update from 2019, which seem to be resolved by now; and a similar problem with the FiraMath font was fixed by updating the font package.

However, even after updating to the newest version (3.01) of newcomputermodern in TeX Live and the current release of Adobe ARDC (2021.001.20135), the problem persists. TeX Studio's internal viewer and other programs (Drawboard PDF, Chrome, Edge) display the file without any issues.

Here is my MWE:

\documentclass[a4paper,11pt]{article}

\usepackage{newcomputermodern}
\usepackage{blindtext,microtype}

\begin{document}
    \section{A Section with \scshape small capitals} % to check whether the font is displayed properly
    {New \textsc{cm} has neat \bfseries bold \scshape small caps}. % so I'd like to keep using the font
    \blinddocument
\end{document}

Is there a way to properly embed the font, or is this an issue on Adobe's side only?

I am thankful for any help or suggestions!

---

Edit

The problem seems to be limited to the Book weight of the font. Loading the font with \usepackage[regular]{newcomputermodern} changes the default weight to the (slightly lighter) Regular weight, which seems to be embedded in a way Adobe deems acceptable.

Answer 1

Version 3.02 has been uploaded to CTAN, and it solves the Acrobat problem. It should be in the mirrors after about a day, so you need to update to this version if you are using Acrobat.