Major Description
The placement rules, CS and FS, all create a new group service instead of using the shared group mapping service. This means that the cache for the placement rules is not same as for the ACL and other parts of the RM service.
It also could cause an issue with the configuration that is passed in to create the cache: the scheduler config might not have the same values as the service config and could thus cause issues. This second issue just seems to affect the CS not the FS.