During testing of RFC6121, noticed that Chat messages sent to a non-existent or non-available user are not being received by other available resources (with non-negative priorities).
According to RFC6121 (https://tools.ietf.org/html/rfc6121#section-18.104.22.168.1):
Send a message to another user, specifying a resource ID for them that doesn't exist, or isn't available.
Openfire 4.0.0 (beta/nightly (5th Jan), using Psi as client.
This appears to be caused by the fix for OF-1008.