TGEA 1.7.1 portals?

I've been trying to make a contained/sealed underground interior. This means it would be getting no ambient light whatsoever. In TGE the dif works great and is 100% black inside except for any baked in or placed lighting.

In TGEA I can't get the portals working, no matter how I export from Constructor. The interior zone mode shows all white faces also, meaning no portals.

I've tried all the export options, except map2difplus for tgea crashes. What is the correct exporter for using portals in tgea 1.7.1?

Thanks :)