Ok well I was able to win the war but not able to annex the province since I couldn't be the one to occupy it.
Settled for humiliation and a little bit of money. Not bad but not what I wanted.
Also I discovered a bug where you're able to add provinces you don't occupy to a peace deal via the little square toggle thing next to the name but clicking the accept button at the bottom causes the game to CTD.
I should have made a video to report but I'm assuming PDX has a representative here. This was on Loonix via Proton so that could be a contributing factor as well but I don't think so in this case.