Git commits in Moodle 3.11.4 by Cameron Ball

commit 2de9208ce85d37f83253ea39d8956a592eddf532
Author: Cameron Ball <cameronball@catalyst-au.net>
Date:   Fri, 24 Sep 2021 14:09:34 +0800
Tag:    v3.11.4

MDL-72670 session: Correct read only debugging logic