Chris Marusich <cmmarusich@gmail.com> writes:

> It appears related to this issue:
>
> https://lists.gnu.org/archive/html/bug-sed/2019-06/msg00022.html

There is actually a bug report for this here:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36150

I have submitted a patch upstream to fix the issue.

-- 
Chris