[WSS4J] client handler chaining with different actors

All,

On client-side I use a handler chain with following actions:

handler1 = Timestamp Signature NoSerialization
handler2 = Encrypt

For both of them I define a different actor in order to get TWO security 
headers but the message on the wire always contains only one header 
(with actor=handler2actor) with all the information (ts, sig, enc) in 
it. I looked through the source and found the location where this 
'overwriting' or 'merging' happens: The method insertSecurityHeader in 
the WSBaseMessage class seems to be 'actor-aware'. But inside of this 
method there is a call to WSSecurityUtil.findWsseSecurityHeaderBlock 
which should add oder supplement a header for a specific actor. But if 
there is already a security header it always returns this one instead of 
creating a new one if the actor differs.

Am I understanding anything wrong or is this a bug?

Regards,
Yves

PS. I'm using the latest source.