OSPF key expire rules violates RFC 2293?

Hi! When an OSPF key lifetime expires then bird stops using that key. E.g. if the configured parameter "generate from time" expires, then bird reverts to an OSPF interface in unauthenticated mode. Is this intentional? Or is it something that can be configured? I think it is not according to the RFC. In appendix D of RFC 2293, the following is stated; "In the event that the last key associated with an interface expires, it is unacceptable to revert to an unauthenticated condition, and not advisable to disrupt routing." Thanks, Kenth