Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   * What was the outcome of this action?
   * What outcome did you expect instead?

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This is a known bug in Emacs 27.1 which has been fixed in later versions,
so rather than reiterate the full description I will refer to the Emacs
bug report and the patch(es) that fix it.

https://lists.gnu.org/archive/html/bug-gnu-emacs/2020-10/msg00703.html
https://git.savannah.gnu.org/cgit/emacs.git/log/?qt=grep&q=43886

The fix, relative to the Emacs 27.1 release, effectively just comments out
one line of code.