I have a somewhat simmilar situation with the one described in reply #7 but 
with a little twist. When I configure static ipv6 address and set dhcp6: false, 
the systems sends a solicit message to the dhcpv6 server, optains an address 
from the pool, generates a privacy address and binds them to the interface in 
addition to the static address. I realised that there might be something wrong 
after I saw the dhcpv6 server updating forward and reverse maps to the hostname 
of the ubuntu machine (server 18.04.02 lts). The radvd server is set to 
assisted (ra flags - managed, other statefull, prefix flags - 
onlink,auto,router).
Please see 
https://askubuntu.com/questions/1118503/ubuntu-18-04-server-configured-with-static-ipv6-request-dhcp-ipv6-address
 for some details

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https://bugs.launchpad.net/bugs/1750392

Title:
  nplan cannot enable IPv6 privacy extensions

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