[Bug 1983197] [NEW] syslog flooded with "Error do-add-ip6-address" "faiilure 95" despite sysctl disabled ipv6

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I find my syslog flooded with those message

`Jul 31 09:26:51 thinkbox NetworkManager[469]: <warn>  [1659252411.4079] ipv6ll[f07ff1ed609280a9,ifindex=3]: changed: no IPv6 link local address to retry after Duplicate Addre
ss Detection failures (back off)
Jul 31 09:27:01 thinkbox NetworkManager[469]: <warn>  [1659252421.4094] platform-linux: do-add-ip6-address[3: fe80::ecec:a4fd:3aae:c6a0]: failure 95 (Operation not supported)
Jul 31 09:27:03 thinkbox NetworkManager[469]: <warn>  [1659252423.4109] platform-linux: do-add-ip6-address[3: fe80::55ff:7f77:6b7e:1fa4]: failure 95 (Operation not supported)
Jul 31 09:27:05 thinkbox NetworkManager[469]: <warn>  [1659252425.4140] platform-linux: do-add-ip6-address[3: fe80::3b33:a2a2:2287:b08b]: failure 95 (Operation not supported)
Jul 31 09:27:07 thinkbox NetworkManager[469]: <warn>  [1659252427.4154] platform-linux: do-add-ip6-address[3: fe80::8656:3f2a:bba6:ab08]: failure 95 (Operation not supported)
Jul 31 09:27:09 thinkbox NetworkManager[469]: <warn>  [1659252429.4185] platform-linux: do-add-ip6-address[3: fe80::2066:f2e7:db8a:460b]: failure 95 (Operation not supported)
Jul 31 09:27:11 thinkbox NetworkManager[469]: <warn>  [1659252431.4210] platform-linux: do-add-ip6-address[3: fe80::6e7d:ede7:fac0:a6e3]: failure 95 (Operation not supported)
J`

which is odd provided that 
a) I have used sysctl to disable ipv6 on all device 
b) via linux command line ipv6 is also disabled
c) the loopback device `lo  reported in the `failure 95` is not even reported to be managed by NetworkManager nmcli 
`DEVICE         TYPE      STATE         CONNECTION
wlan0          wifi      connected     malware_5G
p2p-dev-wlan0  wifi-p2p  disconnected  --
eth0           ethernet  unmanaged     --
lo             loopback  unmanaged
`

** Affects: network-manager
     Importance: Undecided
         Status: New

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syslog flooded with "Error do-add-ip6-address" "faiilure 95" despite sysctl disabled ipv6 
https://bugs.launchpad.net/bugs/1983197
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