Steps to reproduce the issue

Change a modules access level to Guest

Expected result

Module is only visible to guests and not logged in users (this works)

Actual result

After saving the module, when returning to the administrator backend, Extensions > Modules (Site), the module is no longer available for editing, regardless of the search criteria entered. Temporary resolution was to locate the Module within the database and change the permission/access from "5" to "1" within the database. This reestablished access to the module from the administrator backend.

System information (as much as possible)

PHP Built On Linux mXX.siteground.biz 3.12.18-clouder0 #85 SMP Mon Apr 3 10:28:14 EEST 2017 x86_64
Database Version 5.6.36-82.1-log
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 7.0.25
Web Server Apache
WebServer to PHP Interface cgi-fcgi
Joomla! Version Joomla! 3.8.2 Stable [ Amani ] 7-November-2017 15:00 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36

Additional comments

Again, this works just fine on the frontend of the website, but it appears the module permissions setting is getting read/inforced on the administrator backend as well.