Is there a bug when placing multiple gallery lots one after the other?

I’ve been creating a template save by downloading and placing lots from the Gallery across multiple worlds. It worked mostly fine from Willow Creek through Copperdale, with only occasional loading-screen freezes that fixed after restarting.

But once I reached San Sequoia, the endless loading screen started happening immediately when trying to place lots. The same issue then happened in parts of Chestnut Ridge and now Tomarang, to the point where I can’t even enter certain lots without getting stuck.

I’ve been saving frequently, using “Save As,” deleting cache, and restarting the game, but nothing has fixed it. I’m worried the save may be corrupted after placing so many Gallery lots and really don’t want to lose hours of work.