Furniture falling of the second floor

[Doc_Brano]

Summary:
So i build a nice house, second floor in it. Placed some beds, they drop trough the floor. same with dresser
Steps to reproduce:

1. build a house with 2 floors
2. place some furniture
3. see your furniture dropping to the ground

Expected Results:
bed being on the second floor
Actual Results:
bed dropped to the bottom floor
Notes:
They also drop down a level when the bottom layer is removed for the floor. The ghost image is then pushed aside until it has no more room and then pops/up the level completely out of place
Attachments:

Version Number and Mods in use:
latest unstable branch with debug tools
System Information:

[thelegorebel]

I had the same issue, except my beds were on the first floor. When I hit start building, they fell through to the ground, and into the wall. The Hearthlings did end up placing them correctly though, albeit through a wall.