What do you mean they are missing? What model do you have?. If you have a lower model they might be missing.
You can create the vlan interface from GUI:
In Network>Interface>Create New>Interface and you select Type vlan.
You can cackup the config and modify it to remove the zone and create firewall policies without the zones and restore the modified config, but that requires some tweaking, it might be dangerous if you are inexperienced.
There is no patch for human stupidity...