Hello!

I may or may not have been trying to rewrite `org-clock-sum' for like
the 5th time.

Anyways I was wanting to parse a file using `org-element-cache-map' that
looked roughly like this:

========
* clock
:LOGBOOK:
CLOCK: [2024-03-24 Sun 15:18]--[2024-03-24 Sun 15:39] =>  0:21
:END:
=======

However I couldn't get the clock element this way.  After much trail and
error I found that simply adding another heading on the end allowed me
to get the clock element!

I've attached a test so you can reproduce the problem.  In the test it
is a paragraph element that is not showing up.