Yeah I will look into this! It was more to see how it happened so I can visualize why it might not have given you it, It will be my focus for the next patch! Sorry about the inconvenience, I'm just hoping that its more to do with the star code than anything else!
Viewing post in Bug Report Thread
To update on my side of things, I can now confirm that I started up the game fresh; went into Custom Night mode, selected Potluck, and clicked nothing else besides Play to start it up. Completed it on the first try of that session and still got no third star, so there definitely seems to be something tied to the star unlock trigger.