Unfortunately have been receiving both 800/801 codes when trying to load into two Willow Creek lots. Pique Earth and Movers & Shakers. I have quite a bit of rental units in my save, but that's why I bought For Rent.
It sucks that we can't play with the features of a game pack we purchased because they cause save breaking bugs. I am more than willing to send in saves with CC/Mods and without because as a lifelong Simmer I'm not trying to abandon the game I love and have invested thousands of dollars into.
Things get to a point where it is almost disrespectful to release features such as 'pack disabling' and then announce another pack for people to preorder and buy, when these kind of bugs exist within the game and other packs. I put in years of work into my current save file and I refuse to let this bug or any destroy that. I think players are more than justified in wanting to boycott the next and any future pack releases until these issues are resolved.