I am on the last quest and no matter what I do with the think tank, I can't leave. I mainly try to negotiate with them but when I leave to the sink it just freezes on a black screen or works for a little bit if the guide is open but ends with freezing. Any help would be appreciated

No issues here, except no caps from selling items. Quests all went fine.

I want to be able to finish this but sadly I can't. I just gave up and beat HH lol.