Switch Unbuildable Area on Beach Farm with no blockage

wildandblue

Sodbuster
I’ve been trying to put my cabin in this spot on the Beach Farm. Despite having nothing there, it won’t let me.
I was curious about this so recreated the same scenario on my iPad (yes, I realize you're on Switch) to see if I could reproduce it, and could not. What happens if you move the intended cabin location a little to the north or remove some of the stone path immediately in front of where you want to put it?
 
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