Bad hyperref highlighting for biblatex citations

Question

I am using the hyperref package to highlight URLs, abbreviations, and shorthand in citations for convenience in a document, and I am using biblatex-sbl to get citations in SBL format. The hyperref package generally does a great job highlighting things like the shortjournal or shortseries fields in citations, but it seems to trip up when it tries to highlight the shorttitle field of an article citation: the opening quote of the short article title is highlighted with the rest of the title, but the close quote is not.

For the sake of reproducibility, I've attached some code for a minimal (non-)working example, which consists of a bibliography file and a TeX file.

bibliography.bib

@article{
    MWE20,
    author = {Joey McCollum},
    title = {A Minimal (Non-)Working Example},
    shorttitle = {MWE},
    journal = {TeX Stack Exchange Quarterly},
    year = {2020},
    pages = {1--2}
}

mwe.tex

\documentclass[12pt]{article}
%Include support for hyperreferences:
\usepackage{hyperref}
%Include support for citation format:
\usepackage[style=sbl, ibidtracker=false, idemtracker=false, citepages=omit, backend=biber]{biblatex}
%Add the bibliography source file:
\addbibresource{./bibliography.bib}
\begin{document}
    This is a minimal (non-)working example.\footnote{\cite{MWE20}.} It is intended to illustrate unexpected behavior in \LaTeX.\footnote{\cite[2]{MWE20}.}
    \printbibliography
\end{document}

I typeset this using the TeXLive 2020 release of pdfLaTeX and the corresponding release of XeLaTeX; both engines will reproduce this behavior.

I imagine the issue has something to do with substitutions made by biblatex-sbl to ensure that a comma following a title in quotes is placed within the quotes (in accordance with American English style), but I can't say for sure. As it is, the current highlighting is a bit ugly. If there was a way to highlight the shortened title more consistently, either by including both the surrounding quotes and the comma or by highlighting only the title itself, without the surrounding quotes and the comma, that would be great. Is there any easy way to fix this, or is it a bug that will have to be fixed in one of the packages involved?

EDIT: As moewe has pointed out in the comments, this has been a known bug in biblatex for a few years now (https://github.com/plk/biblatex/issues/499), and it affects citation styles other than sbl (such as verbose-note).

Answer 1

Adapting @UlrikeFischer and @moewe's solution does appear to work:

Try this:

\documentclass[12pt]{article}
\begin{filecontents}[overwrite]{\jobname.bib}
@article{MWE20,
  author = {Joey McCollum},
  title = {A Minimal (Non-)Working Example},
  shorttitle = {MWE},
  journal = {TeX Stack Exchange Quarterly},
  year = {2020},
  pages = {1-2}
}
\end{filecontents}
\usepackage[colorlinks]{hyperref}
\usepackage[style=sbl, ibidtracker=false, idemtracker=false, citepages=omit, backend=biber]{biblatex}
\addbibresource{\jobname.bib}

\makeatletter
\renewbibmacro*{shorttitle}{%
  \iftoggle{blx@useshorttitle}
    {\iffieldundef{shorttitle}
       {\iffieldundef{title}
          {}
          {\ifbool{bbx@inset}
             {\printtext{\bibhyperlink{\strfield{setkey}}
                {\printtext[title]{\printfield[titlecase]{title}}}}}
             {\printtext[title]{%
                \printtext[bibhyperlink]{\printfield[titlecase]{title}}}}}}
       {\ifbool{bbx@inset}
          {\printtext{\bibhyperlink{\strfield{setkey}}
             {\printtext[title]{\printfield[titlecase]{shorttitle}}}}}
          {\printtext[title]{%
             \printtext[bibhyperlink]{\printfield[titlecase]{shorttitle}}}}}%
     \newunit}
    {}}
\makeatother

\begin{document}
\null\vfill
This is a minimal (non-)working example \autocite{MWE20}. It is intended to
illustrate unexpected behavior in \LaTeX \autocite[2]{MWE20}.
\printbibliography
\end{document}