From a couple minutes of messing around, it looks like the Charactermancer doesn't add Paladin Oath expanded spells to the list at all, or Cleric Domain spells. Meanwhile, if I make a lvl 1 Warlock, I am provided the expanded spells, but if I multiclass my Paladin into Warlock I do not. Actually, Oath and Domain spells are always prepared, so that makes sense. But it is still breaking the Warlock, at least.