Effect of "Read Resource" security right on SMS_Group namespace classes

Background: I am developing a plugin for SCCM 2007 and the plugin settings are stored under a class of \ROOT\SMS\site_XXX:SMS_Group abstract class. A very peculiar problem was reported to me & I am investigating that case. The test case involves installing my plugin, but the problem can be seen without plugin. So I am stating the problem on a generic SCCM class, different from plugin class but issue is same.
 
Test case:
1) Provide 'Read Resource' security right on Collection class (SCCM Console/Site/Computer Management/Collections, right click properties & open Security tab).
2) Open 'WMI CIM Studio' and browse to \ROOT\SMS\site_XXX namespace, where XXX is SiteCode (WMI CIM Studio: )
3) Under this namespace, search & open 'SMS_Group' class. Locate class 'SMS_G_System_Current' under this. With class 'SMS_G_System_Current' selected, click on 'Instances' button in the menu toolbar on right side of the window.
4) The instances are listed.
5) Now disable 'Read Resource' security right on Collection class.
6) Refresh 'SMS_Group' class and locate class 'SMS_G_System_Current'. Click on 'Instances' button.
7) None of the instances is displayed and the message says 'No instance available'.
The question is how 'Read Reource' right on collection class affects reading a table under subclass of SMS_Group class.
 
PS: Due to the inability to read the plugin settings without 'Read Resource' right, the plugin fails & doesn't work. Hence requesting for help.
 

Yes, I know this is an old post, I’m trying to clean up older posts that are unanswered.
Did you ever figure this out?