Gate can't be placed on slope

@annaliese39 okay, I see what you are seeing now - this issue is occurring because you have placed fencing on a foundation, and the game handles foundations differently now that terrain manipulation has been introduced.  I'm not sure if this will be considered a bug since, if I'm not mistaken, you would have to have bb.moveobjects turned on in order to set up a gate placement like this even before the patch.  I will ask about it though.  In the meantime, one thing you can do with bb.moveobjects on is place the gate just a *touch* in front of the area where you'd ordinarily put it.  Judging from your screen shot, with the two columns to either side, the gate will still look like it's in position, and the functionality tested out okay in my game.