In other news, so it seems TFP did something to change the offsets of multidim blocks in Unity (the 2,x,x ones and the 4,x,x ones) for 18.3, so I'm going through the blocks adding the following property to any block that has a multidim line of 2,x,x or 4,x,x (I don't have any 6,x,x ones but I suspect they'd be affected as well). The property line, if you want to add it yourself, is:
<property name="ModelOffset" value="0.5,0.5,0"/>
...since 18.3 seems to have the issue, and a19 is supposedly right around the corner, I'm not sure I'll push the fix since they may revert right back for a19.
I'm *guessing* they re-exported their blocks and had the scene backwards, but I'm really not sure.