I can confirm this bug. After upgrading to 3.16.7-ckt20 (custom build from source), FreeRADIUS stopped responding to auth queries from hostapd, wifi clients using EAP-TLS, EAP-TTLS or EAP-PEAP could not authenticate any more. Downgrade to 3.16.7-ckt11 (custom build from source) fixed this issue.