Just finished my first game as Warlock using some of the new Demon support and quite a few of those cards don’t seem to work.
Endgame summoned my Sargeras, despite several other Demons (namely Wretched Queen and Enhanced Dreadlord + Token) dying after him.
Archwitch Willow didn’t summon a demon from my deck (despite Wretched Queen still being in it).
Crane Game had the same issue, not summoning any minion.