I was fiddling around with compendium commands today too and I noticed a couple of things... I'm running a Curse of Strahd game and it has occurred to me that monsters and other such things don't list in the compendium from this particular module (weird) even if attempting to view them from a different game. In this case, LMoP. I also noticed that if the token might not be in the module already (I was fiddling with Bugbear and Hobgoblin in this case) they must be transmogrified from Mines to Strahd. But, tokens that might belong in Strahd like Commoners and Wraiths have no trouble. Unfortunately I can't think of a way to "trick" the system into using VGtM or XGE as they don't create games to transmogrify from. It would be nice if the compendium was whole and complete to what people have purchased, so if there's a fix I'd love to hear it.