old static ipv6 will not disappear

[leifnel]

My opnsense had a static ipv6 on fibre, but now it's connected to a 5G modem instead.

I've changed the wan to dhcpv6

But still, if I go in shell, I see the old static ip

I've examined the backup xml, but the old ipv6 is not there.

I can remove it with ifconfig re0 inet6 2a02:xxx::2 delete but it reappears a little later

Where could it be hiding?