Re: Could not locate this item
@CharmB789 Good. If you have a functioning version of the lot that's in your game library that is very helpful. It's also helpful that the lot is in a different save and functioning there.
With the combination of information in mind that you just shared I'm inclined to think the issue may be your CC. Please try removing your CC and the cache as follows:
Move your Mods folder from your "The Sims 4" folder [Documents > Electronic Arts > The Sims 4] to your desktop (save it for reference) and delete the localthumbcache.package file in your “The Sims 4” folder. Then check in a new game save to see if this issue is still occurring. If the issue is gone, please re-add the Mods/CC one at a time until you find the one causing the issue.
Even after removing the CC/Mod(s) causing the issue you may want to place the 'clean' (no CC) version of the home on the lot instead. I look forward to hearing how it goes. Thanks!