Along similar lines, though maybe not exactly what you're referring to, there are floor-based issues with the lots in the Pendula View neighbourhood in Willow Creek.
I was never able to place floor tiles completely along the front edges of the lots - one tile would always disappear. Also, normally when you try to place down a lot too big for the lot you're putting it on, you can move it around and anything over the edges gets cut off right? - not on those lots - on those lots it would let you attempt to place a lot at all if the dimensions of what you're placing exceed to size of the lot you're placing it down in.
Sorry if it's off-topic; I've always wanted to point that out.