6in4 tunnel down after each reboot

[abraxxa]

I *think* his happened already in the last 16.7 version after I'm renamed the 6in4 interface description.
After upgrading to 17.1 the issue still exists.
The 6in4 interface is shown as down, disabling the interface, saving, enabling it again, saving and applying brings it back up.

I found some log messages that might be related to this:

opnsense: /usr/local/etc/rc.bootup: The command '/sbin/route delete -inet6 'default' '2001:f00:9e:99::1'' returned exit code '1', the output was 'route: route has not been found delete net default: gateway 2001:f00:9e:99::1 fib 0: not in table'
opnsense: /usr/local/etc/rc.bootup: ROUTING: setting IPv6 default route to 2001:f00:9e:99::1
opnsense: /usr/local/etc/rc.bootup: The command '/sbin/ifconfig gif0 tunnel '216.66.86.122'' returned exit code '1', the output was 'ifconfig: 'tunnel' requires 2 arguments'
kernel: gif0: link state changed to DOWN

I haven't tried deleting the whole 6in4 interface, gateway and gif interface as I don't want to lose my interface specific firewall rules.
If there is a way to backup and restore those I'll just try that.