@Damienf519 There are certain store items I like to have in all worlds I play in. I have an archery range, a small bakery, a simple greenhouse, and a small dance studio I want in all of my worlds. In my current project, I want to keep the community lots small, so I used the smallest City Hall I have, which came from a store world, Riverview, I think. I also like to add basketball hoops and climbing walls to some lot in the worlds I play in. If I can't get those in in CAW, it's not too big of a deal to add them in a starter save. I have to make starter saves for custom worlds anyway, since I can't populate them in CAW, because my residents have pets.
But the world I was referring to in my opening post was originally exported with all of those lots, plus a wedding chapel I made using stained glass windows from the Prism Art Studio, the pet store from the store, and the Serenity Retreat. I didn't have any problems exporting it back when I made it, several years ago. I was disappointed, and still am, that I couldn't fix it in CAW without losing the store content.