Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.  You don't know how to make a good report?  See

     https://orgmode.org/manual/Feedback.html#Feedback

Your bug report will be posted to the Org mailing list.
------------------------------------------------------------------------

I have noticed that some of my drill entries are skipped by org-drill,
and only
recently took the time to try to troubleshoot why – apparently
org-drill-entry-empty-p returns t for my entries, because they look like
the
following:

-----
* Entry question? :drill:
SCHEDULED: <2019-04-05 Fri>
:PROPERTIES:
...
:END:

** The Answer

Some text
----

Since org-drill-entry-empty-p only looks from the end of the
metadata/properties
and until outline-next-heading, it will consider this drill entry empty
– even
though this is not at all my intention. This would be fixed by replacing
(outline-next-heading) with (outline-forward-same-level 1) in
org-entry-empty-p.
I'm not sure whether this has any other adverse effect, but I can't see
how it
would make things worse, at least.

Emacs  : GNU Emacs 26.2 (build 1, x86_64-apple-darwin18.6.0, Carbon
Version 158 AppKit 1671.5)
 of 2019-06-15
Package: Org mode version 9.1.6 (9.1.6-48-gfe7619-elpaplus @
/Users/christoffer/.emacs.d/elpa/org-plus-contrib-20180212/)