Comment # 4 on bug 953795 from Andreas Schwab

Enabling nanny does not help.  It only preserves the IPv4 lease across restarts
of wickedd.service but still drops the IPv6 lease.

Jun 20 11:46:26 hawking systemd[1]: Starting wicked network management service
daemon...
Jun 20 11:46:26 hawking systemd[1]: Started wicked network management service
daemon.
Jun 20 11:46:27 hawking wickedd[19792]: route ipv4 0.0.0.0/0 via 10.160.255.254
dev br0 type unicast table main scope universe protocol dhcp covered by a
ipv4:dhcp lease

br0             up
      link:     #33, state up, mtu 1500
      type:     bridge
      config:   compat:suse:/etc/sysconfig/network/ifcfg-br0
      leases:   ipv4 dhcp granted
      leases:   ipv6 dhcp requesting
      addr:     ipv4 10.160.4.0/16 [dhcp]
      addr:     ipv6 2620:113:80c0:8080:10:160:4:0/64
      addr:     ipv6 2620:113:80c0:8080:92b1:1cff:fe69:ddc/64
      addr:     ipv6 fd67:22d1:509b:1:92b1:1cff:fe69:ddc/64
      route:    ipv4 default via 10.160.255.254
      route:    ipv6 default via fe80::1

Only a full wicked restart restores the network.