When I configure an ipv6 address like 10::10 (10:0:0:0:0:0:0:10)

PUT /restconf/config/ietf-interfaces:interfaces/interface/GigabitEthernet0%2F8%2F0/ietf-ip:ipv6

{"ip": 10::10, "prefix-length":64}

then operational data and VPP dump both show address 10:0:10:: (10:0:10:0:0:0:0:0)

performing the same steps through CLI works as it should:

vppctl set interface ip address GigabitEthernet0/8/0 10::10/64
vppctl show interface address
GigabitEthernet0/8/0 (dn):
10::10/64