Missing pre & post hooks

It appears that when a group contact is updated, the pre & post hooks are not fired. I believe they are missing in the method:
CRM_Contact_BAO_GroupContact::updateGroupMembershipStatus()

I can add them before and after the query if they are indeed missing. If they are present somewhere else in this flow then I must be having a different problem. However, in the same class it seems that the hooks are present in other methods, so I assume this is the place they should be added.