Cannot remove IPv6 from LAN interface - The DHCPv6 Server is active on this int.

[nzkiwi68]

Error on attempting to remove IPv6 from LAN interface:

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The following input errors were detected:

    The DHCPv6 Server is active on this interface and it can be used only with a static IPv6 configuration. Please disable the DHCPv6 Server service on this interface first, then change the interface configuration.
But it's not active.

I have disabled IPv6 completely. I use KEA for IPv4, no IPv6 on the WAN interface at all, and  "ISC DHCPv6" shows a lan interface with "Enable DHCPv6 server on LAN interface" not selected.

Kea DHCPv6 is disabled.
I have rebooted multiple times.

[franco]

Try to disable all "track interface" settings referencing it first.