Could not relay BYE to wss client

Hello,

While developing config for WebRTC proxy. Issue I have - inability to forward BYE from UDP side to WebRTC. We have updated to 5.8.8 with no luck.Issue we have shown in log bellow: we have an error message that tells Via could not be built.

Mar 20 18:42:17 pbxKamaTestSBC /usr/local/kamailio/sbin/kamailio[1390086]: DEBUG: call_1774014127984617813|BYE|<null><core> [core/msg_translator.c:1859]: check_boundaries(): no multi-part body
Mar 20 18:42:17 pbxKamaTestSBC /usr/local/kamailio/sbin/kamailio[1390086]: WARNING: call_1774014127984617813|BYE|<null><core> [core/msg_translator.c:3036]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not be found
Mar 20 18:42:17 pbxKamaTestSBC /usr/local/kamailio/sbin/kamailio[1390086]: ERROR: call_1774014127984617813|BYE|<null><core> [core/msg_translator.c:2100]: build_req_buf_from_sip_req(): could not create Via header
Mar 20 18:42:17 pbxKamaTestSBC /usr/local/kamailio/sbin/kamailio[1390086]: ERROR: call_1774014127984617813|BYE|<null>tm [t_fwd.c:484]: prepare_new_uac(): could not build request
Mar 20 18:42:17 pbxKamaTestSBC /usr/local/kamailio/sbin/kamailio[1390086]: ERROR: call_1774014127984617813|BYE|<null>tm [t_fwd.c:1764]: t_forward_nonack(): failure to add branchest

I have tried to display tcp connection id from within the branch, but with no luck. I have printed $nh(u) and $nh(P) before t_relay() and it shows the correct URI and transport to be used. TCP connection id also shows correct and connection alive for the moment of BYE sent. Is there any known issue in that part? What tools could be additionally used to debug it?

$nh(u) and $nh(P):
sip:10.15.151.59:43786;transport=ws ws
connection id to 10.15.151.59:43786 is: 2

# kamcmd ws.dump used_asc
{
connections: {
2: wss:10.15.151.59:43786 -> wss:10.1.97.53:5443 (state: OPEN,  last used 2s ago, sub-protocol: sip)
1: wss:10.15.151.59:43798 -> wss:10.1.97.53:5443 (state: OPEN,  last used 2s ago, sub-protocol: sip)
}
info: {
wscounter: 2
truncated: no
}
}
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