Why UPF is failing to route the packets to gNB in downlink datapath testing?

I am testing datapath by using free5gc, installed gtp5g kernel module for datapath supporting when testing downlink path using iperf the packets are reaching up to UPF and failing to reach the gNB.

Hi,

Can you please attach the pcap file, config file, and give more detail description of the test.
Thank you!