@mariusor @Marius I use these properties to determine who is the owner of an object. When both are present the result is ambiguous and that leads to a security risk in one situation which is currently theoretical but may be important for the client-to-server protocol that I am designing.
So I made the validator more strict to see who is generating objects with ambiguous ownership. Your actor and attributedTo are the same but I currently don't account for that.
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