illuhD I wonder what would happen if you deleted the 1 kb files, and anything smaller. Please understand that this is just an experiment; do NOT save your progress.
With your save loaded, but with a lot loaded that looks the way it should, open the scratch_[numbers] folder and sort it by file size. Delete any file that's less than 3 KB AND that ends in .sav; don't touch the package-clientDB or package-HouseDescription files. Then, without quitting or going back to the Main Menu, try to load one of the lots that's missing its data. Let me know what you find.
Separately, try loading a lot that looks fine, deleting the same small files, then using "save as" to rename the save and therefore create a new save slot. Reload the game and see whether the broken lots are back to the defaults.
Neither of these steps would recover your missing builds, but maybe this would restore the lots enough for you to place something else there. Or maybe not; I have no idea. But it's easy to try.
