Heya! I think that's a great design choice, but the greenhouse in my haunted house is at the back of the lot, furthest away from the spawn point on the Hallows lot in Willow Creek. When I get this glitch, it's never the frontmost door that becomes the front door, it's always the one furthest away (the back door, the shed/greenhouse/outhouse in the back garden). No matter how many times I set the actual front door (at the front of the lot, always the closest door to the spawn point) as the front door, visitors will always revert using the back door/greenhouse door/shed to knock once there's been a loading screen.