Hello -
If a application/client did not have cross_origin_authenication defined, a default value has been specified to match the value that you see in the Admin Dashboard. Previously this attribute (cross_origin_authentication) was not stored and exposed on the client object.
This change is related, but not specific to this deprecation announcement.
Also note, that with this deprecation we will be removing cross_origin_auth to make this less confusing.
Thank you
Brandon