"Restricted Access" behaviour in RTC work items

I have been doing some testing with the new "Restricted Access" feature that enables access to work items to be restricted to a group
If I create a work item, assign it to a access group, that work item becomes invisible and not accessible to users who are not in the access group... except for the person who created the work item.
If a user creates a work item and assigns it to a access group I seem to get some strange behaviour. If the user runs a quick query the work item is hidden from them. If the user runs a full query it seems that the work item is viable to them and they can open the work item, even though they are not in the access group. Note in the test I did the user who created the work item did not have the work item assigned to them. This behaviour seems a little strange and maybe dangerous. Has anyone else noticed this behaviour or can clarify it ?
If a user did not create the work item and is not a member of the access group then the work item is invisible to them, which is expected behaviour.