Hmm, yeah damnit. It's assigned but the recipe uses 5 items while housing can only take 4. I had tested it, but then decided to do some balancing by tweaking recipes, and didn't test that. Though that's not a bad idea for an upgraded building type … at least for later.
I am working on a pretty big update, restructuring the tech tree etc. you can check it out on the [GitHub page(https://github.com/zinovic/ColonialCharter). Idk if I should bother releasing just a fix for this, I'm a few days out of releasing the bigger update which will include it.