pjsip Hangupcause not working

I have a hangup handler on an outgoing PJSIP channel that grabs the SIP 
status
like this:

     NoOp(keys=${HANGUPCAUSE_KEYS()} 
sipmsg=${HANGUPCAUSE(${CHANNEL},tech)})


This works fine if the call connects to the other end but the caller for
example hangs up while it's still ringing:

     NoOp("PJSIP/custom-000000ab", "keys=PJSIP/custom-000000ab sipmsg=SIP 
180 Ringing") in new stack


It also works fine if the call was answered:

     NoOp("PJSIP/custom-000000ad", 
"keys=PJSIP/custom-000000ad,PJSIP/squiresvi-000000ac sipmsg=SIP 200 OK") 
in new stack


But if the remote end returns an error status (eg 404) then I get 
nothing:

     func_hangupcause.c:140 hangupcause_read: Unable to find information 
for channel PJSIP/custom-000000af
     -- Executing [sipdirect2@hangup_handlers_egress:6] 
NoOp("PJSIP/custom-000000af", "keys= sipmsg=") in new stack


Any idea whether this is possible? It works fine in our old Asterisk
systems, but on Asterisk 16 with PJSIP I'm getting nowhere with it.


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