Anybody else unable to build nebula gathering stations?

When I look at the requirements for nebula gathering station, it says there needs to be an F-type star in the system. However, I have systems with F type stars, but I still can't build the nebula refinery.

Curiously, I seem to only have F-type stars in binary and trinary systems, so I'm not able to determine for myself if this is a bug relating to star count in the system. However, I DID integrate a Trill civ with a unary F-type star, and they had the nebula refinery already installed. Indeed, it was after integrating them that I realized I even *could* install the negula refinery; until then I had assumed I needed to find a nebula like in the base game. Though... I don't seem to see any nebula in my galaxy map.

I'm curious if anybody else is getting this phenomena, and if it's a bug or if I'm doing something wrong. And if it IS a bug... I guess how do I report that to the developers.

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edit: Of course after posting I find a unary F type right next to Vulcan. Was able to build a nebula refinery there. So this appears to be related to the number of stars in the system, it's just is it a bug or is this how it's supposed to work?