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hasn't fully restored it's own XG yet
There is currently no support in Dday map format for XG's dummy lines. If an XG def that uses them (which is a big part of XG's functionality) attempts to run, Dday currently shuts down with a debug message saying they are not; "P_AllocDummy: Dummies of type DMU_SIDE not supported."
On top of the bugs at Sourceforge, I also don't think the damage class currently works (i.e no damage is dealt); but, as is my understanding, until the above is re-instated, there is little testing possible with XG.