Few ipv6 prefix pool attributes are not getting set

While running the test on ixia-c and Ixnetwork, faced the below issue:
Test name: https://github.com/open-traffic-generator/conformance/blob/main/devices/bgp/test_ebgpv_route_install.py

The below attributes are not getting set in the Ixnetwork while creating ipv6 prefix pools on BGP:
next_hop_ipv6_address
next_hop_address_type
next_hop_mode