FTA dlc - Marius won't move

So I’ve played through pretty much the entire From The Ashes DLC. I’ve built almost everything and I’ve shown the village to Sir Divish. What remains is building either the alchemy bench or the herb garden for the extended rathaus. Talking to Marius works but once we’ve agreed on what to build he won’t move. Talking to him again does not give me the “we’re gonna build here?” option, I just get the normal “how’s Pribyslavitz doing?” and “Let’s build!”. I have made sure that I have all the necessary groshen and resources.