Thanks - I verified the fix.
________________________________
From: Kyle Meyer <kyle@kyleam.com>
Sent: Saturday, June 13, 2020 3:21 PM
To: John Ciolfi <ciolfi@mathworks.com>
Cc: emacs-orgmode@gnu.org <emacs-orgmode@gnu.org>
Subject: Re: Bug: fontification error with #end_src in 9.3.7 [9.3.7 (9.3.7-dist @ /PATH/TO/org/install/emacs/site-lisp/org/)]

Kyle Meyer writes:

> I'll try to take a closer look tomorrow.

This should be fixed by ba6ca79af.