Hello Experts.
Someone maybe had similar issues to save my time
In some testings having issue with VoLTE, qci5 bearer is establishing fine but UE is not registering.
On PCAP log I can see only sip register request but no response from IMS.
Only suspicious thing is warning on IP header: ipv6 payload length exceeds framing length.
MTU size is 1500 so that is ok.
Where did you capture PCAP, MTU is not 1500 at UE it would be in 13xx range (unless jumbo frames are in network), check the configuration received for IMS apn for the MTU size.
This problem is usually MTU related.