Player-thrown splash and lingering potions of Harming do knockback to mobs

This is something I would like to get clarification on whether it's intended or not, since it doesn't actually appear to have been reported before (despite being in the game since at least 1.3).

Player-thrown splash and lingering potions of harming (or healing to undead mobs) will deal knockback to mobs caught within the damage radius. As splash potions do magic damage instead of being a physical attack, it seems logical that no knockback should be dealt.

This is also inconsistent with throwing splash water bottles at Blazes and Endermen, which causes no knockback (although it may cause the Enderman to teleport).