This is a response from requests from several big customers. A lot of customers send installers on-site for AP installation. Another person in a remote site to configure the AP. As it may take some for the remote person to configure the AP after the AP is installed, our customers raise concerns on possible security loopback. Thus, we respond the request by changing the default behavor on the radio interface.
The change in behavor should be documented in the release notes and the quick reference card shipped in new hardware.