close chest: don't replace a node if it's not the expected open chest #3046
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this is similar to #3045. currently, closing a chest dialogue will replace anything currently at the location of the chest when the dialogue was opened, even if it's another node or air. currently this can be exploited very reliably w/ mesecons sticky pistons, but other players have reported that it can be exploited unreliably w/ tnt (even though open chests should be tnt-proof?). but in general, there's no way to guarantee that the node hasn't changed since we opened it.