In version 1.9.7 the permission callback was [added](https://github.com/Automattic/liveblog/pull/685/files#diff-71ed1335434845812fc1e5eec7f22f93f7c19521f488e5588ccd772c39db4f94R208) for `/liveblog/v1/authors/` endpoint and with that change author search is not working.  Other endpoints are working fine though with the same permission callback.