Thanks, Georg, for root causing the restriction problem. I've filed https://jira.apache.org/jira/browse/SLING-8302 to document the problem. In the meantime, I'll look into reformulating our access control policies as deny restrictions.
Sorry for creating a new thread from a different email; our email servers changed recently and replies to the list aren't working. I'll use this email in the future.
Best regards, John