Let's say, I throw an Dwarven Daisy1 at a creature that is weak to Fire. The bomb deals direct fire damage to its target, and also Fire Splash damage.
If the target is vulnerable to fire, is the damage of both the direct and the splash increased by the vulnerability (effectively double dipping in this case)?
1 Chosen because it does both fire damage and fire splash damage, but has no persistent damage for the sake of simplicity.