Ideas
I accidentally posted my Report in the identical bug for the consoles section, apparently the creation of /specifically/ a daycare in Businesses and Hobby's leads to a situation where I am unable to save. I /believe/ this is related to the recent laundry list item regarding supervised customers at Businesses (i forgot what bug that was specifically but I remember supervised customers were a no go), also as the error code/bug is one of save prevention I have no save after it, but I do have a save prior to the reproduction steps I listed in the consoles section (stupid Google sent me to a playstation item). If you think it would help I can definitely attempt to send in my save, but knowing what I know this isn't something that's saved in the game data (because the error is failing to save after opening a daycare/small business with supervised customers)
Update: My Google Drive File with Both the last save before the error and my most recent last_exception dated after the failsure of the save:
https://drive.google.com/file/d/14oCexhGBEjEZc7C0gKa9euMAO3RTNviQ/view?usp=sharing