I don't know why but ambient buildings are still present in the latest settlement I made in DaC even though we use the ambient building reduction mod:
Spoiler Alert, click show to read:
I'm using the 'scripts' faction slot, which is an unplayable faction:
Spoiler Alert, click show to read:
By the way I can use the slave faction slot (also unplayable) just fine, so I'm not totally sure it has something to do with that.