Sorry its "groups: [2]" not one. Just rechecked with the terrain definition of my alien bases.
Yeah, you are right after all. Apparently my Alien Base code was outdated. All entry blocks were labelled as group: 6 instead of 2.
Moreover, these blocks are also marked as type: 6. I can't even remember what it was for, but I think it's a remnant feature now?
Anyway, this was indeed a stealth bug; the base generated fine for me. Sorry about that, I'll fix it ASAP.
EDIT:
Version 1.9.6 is uploaded.- Added Plasma Sub.
- Some new Polar maps.
- Added one Alien Base map.
- Fixed a bug with Alien Base terrain generation.
- Fixed Supply Ship maps (by Hellrazor).
- Additional translations by Kammerer and F.E.K.