This isn’t specifically a scripting issue but for some reason, I’m unable to add places to my starting places, even if create and save place API are enabled. I consistently get this regardless of where I am.
You can no longer change the start place of a game – this includes adding a start place of another game to the current game (you would be changing the start place of the other game). If you want to add places to your game, you’ll need to open it in Studio, right click Places in the Game tab, and select “Create new place”. You can then publish another one of your games over the created place if you want that content in your universe.