Why does [alldates=terse] cause an error with biblatex?

Question

I'm using MacTex 2019 as my LaTeX environment. Everything seems to work properly except this thing. For some reason, the minimal example at the bottom gives the following error:

main.tex:23: Undefined control sequence.
\lbx@us@mkdaterangetrunc@short ...}}}}}\endngroup 

The error is gone if I change the option alldates to something else than terse such as long or short.

How could I make the terse option work as that is the format I'd like to use? Am I doing something wrong here?

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{csquotes}
\usepackage{filecontents}

\begin{filecontents*}{ref.bib}
@online{foo,
  title={Foo},
  url={https://example.com},
}
\end{filecontents*}

\usepackage[backend=biber, alldates=terse]{biblatex}

\addbibresource{ref.bib}

\begin{document}
\section{Introduction}

Introduction \cite{foo}.
\printbibliography

\end{document}

Answer 1

This issue was caused by a bug that was resolved in biblatex 3.13.

Please update your TeX distribution to obtain the current versions of biblatex and Biber.

This is an embarrasing typo in english.lbx (\endngroup instead of \endgroup). The issue has already been fixed in the dev version of biblatex (https://github.com/plk/biblatex/commit/c33c966736762a6158830512f65f5a54c745952b), the fix is included in biblatex v3.13.

For the time being, you can patch the relevant macro (note that you have to do that in \AtBeginDocument or after \begin{document}, because the patch must come in after english.lbx is loaded).

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{csquotes}
\usepackage[backend=biber, alldates=terse]{biblatex}

\addbibresource{biblatex-examples.bib}

\makeatletter
\AtBeginDocument{%
  \patchcmd{\lbx@us@mkdaterangetrunc@short}
    {\endngroup}
    {\endgroup}
    {}{}%
}
\makeatother

\begin{document}
\cite{sigfridsson}
\printbibliography
\end{document}