Textemdash doesn’t render in biblatex with moderncv

Question

I am trying to include a bibliography (with biblatex) in a CV (with moderncv). However, when I include a \textemdash{} in a field of a bibliography entry, it renders as a space instead of an em dash. This behavior doesn't happen when I switch to \documentclass{article}, nor does it happen with \textemdash{} outside of a bibliography entry, nor does it happen with --- instead of \textemdash{}. Following is an MWE.

main.tex:

\documentclass[11pt,colorlinks,linkcolor=true]{moderncv}

\moderncvstyle{classic}
\moderncvcolor{blue}

\usepackage[backend=biber,
sorting=ydnt]{biblatex}

\firstname{John}
\familyname{Doe}

\addbibresource{mybib.bib}

\begin{document}
    \makecvtitle
    
    \nocite{*}
    
    The following should render as ``Hello \textemdash{} World!'':
    
    \printbibliography
    
\end{document}

mybib.bib:

@misc{helloworld,
    title = {Hello \textemdash{} World!},
    author = {Doe, John},
    date = {2021-08},
}

Renders as:

Answer 1

Biber recodes the \textemdash in your title to —.

The example compiles fine with a current version of LaTeX and XeLaTeX, but I could reproduce an issue with the XeLaTeX in Overleaf's TeX Live 2020 (https://www.overleaf.com/read/rggbprxmtthn). There the problem could be fixed by loading \usepackage{fontspec}, which is probably not that bad an idea if you use XeLaTeX or LuaLaTeX anyway.

With \usepackage{fontspec} https://www.overleaf.com/read/zhyqysgwfynf, i.e.

\documentclass[11pt,colorlinks,linkcolor=true]{moderncv}
\usepackage{fontspec}
\moderncvstyle{classic}
\moderncvcolor{blue}

\usepackage[backend=biber,
sorting=ydnt]{biblatex}

\firstname{John}
\familyname{Doe}

\begin{filecontents}{\jobname.bib}
@misc{helloworld,
    title = {Hello \textemdash{} World!},
    author = {Doe, John},
    date = {2021-08},
}
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
  \makecvtitle
  \nocite{*}

  The following should render as ``Hello \textemdash{} World!'':

  \printbibliography
\end{document}

shows

as expected.