>
>> It is pretty tricky to debug, but the failure starts with 4a27b67fd
>> (org-element: Fix property drawers parsing, 2020-04-22).  As far as I
>> can see, the pattern introduced there is perfectly valid and should be
>> compatible with Emacs 24.  I'd _guess_ this is a pcase bug in Emacs 24,
>> particularly the one fixed by 528872c5f8 (bug#18554, 2014-09-27), but I
>> didn't make an effort to try to understand that commit.
>>
>> Interestingly, the error goes away if I just swap the elements in the
>> pcase (and ...) pattern added by that commit.  Dunno, but if that clears
>> up the failure on your end as well, I don't see any reason to not make
>> that change.
>>
>>
>> diff --git a/lisp/org-element.el b/lisp/org-element.el
>> [...]
>
> Yes, that fixes the problem over here.

Thanks for confirming.  Pushed (73c929e3b).