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I don't think it's a bug, since the cart is available to the hero. It's just not dragged into the utopia, and arrows are passed through the door :D. The tent also seems to work (I'm not sure). Apparently, there isn't enough space for combat units when building a circle. But it's an interesting question, and it immediately raises several more. Perhaps the answers can be found in the Physics Guide - I haven't looked at it in a while.
There's nothing about the cart in the Physics Guide.
Stop hard - Go Pro!:smile49: