unbound_1.16.0rc1 fails to start

[RayG]

Installing unbound_1.16.0rc1 over the top of the current install
(unbound_1.15.0) it fails when started

29/05/2022 15:32:12 C:\Program Files\Unbound\unbound.exe[12244:0] error:
setsockopt(..., IPV6_MTU, ...) failed: Bad protocol option.
29/05/2022 15:38:02 C:\Program Files\Unbound\unbound.exe[1192:0] error:
setsockopt(..., IPV6_MTU, ...) failed: Bad protocol option.
29/05/2022 15:40:01 C:\Program Files\Unbound\unbound.exe[9700:0] error:
setsockopt(..., IPV6_MTU, ...) failed: Bad protocol option.

With verbosity 4:

[1653835814] C:\Program Files\Unbound\unbound.exe[12340:0] debug: winservice
- apply cfg
29/05/2022 15:50:14 C:\Program Files\Unbound\unbound.exe[12340:0] debug:
setup SSL certificates
29/05/2022 15:50:14 C:\Program Files\Unbound\unbound.exe[12340:0] debug:
Adding Windows certificates from system root store to CA store
29/05/2022 15:50:14 C:\Program Files\Unbound\unbound.exe[12340:0] debug:
Completed adding Windows certificates to CA store successfully
29/05/2022 15:50:14 C:\Program Files\Unbound\unbound.exe[12340:0] debug:
winservice - open ports
29/05/2022 15:50:14 C:\Program Files\Unbound\unbound.exe[12340:0] debug:
creating udp6 socket ::1 53
29/05/2022 15:50:14 C:\Program Files\Unbound\unbound.exe[12340:0] error:
setsockopt(..., IPV6_MTU, ...) failed: Bad protocol option.

Edition	Windows 10 Pro
Version	21H2
Installed on	‎04/‎04/‎2022
OS build	19044.1708
Experience	Windows Feature Experience Pack 120.2212.4170.0

RayG
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