On Tuesday,  2 Jan 2018 at 23:16, Narendra Joshi wrote:

[...]

> Are you able to reproduce this in Emacs started with `emacs -Q`?

That would be challenging.  

In any case, others have pointed me to the bug list for emacs.  It seems
that this is a known bug for which there is not yet a fix:

  https://lists.gnu.org/archive/html/bug-gnu-emacs/2017-12/msg00665.html

Thank you.

-- 
Eric S Fraga via Emacs 27.0.50, org 9.1.6