Charged staff Melee property

In the tooltip the Charged Staff monk ability does not have Melee property, but when hovering the damage tooltip I found out that the shockwave scales with Melee passive nodes, e.g. "Reaching strike". On the other hand the Staggering palm has the Melee property, but its shockwave is also not scaled with Melee increases. I understand it in a way that only the original hit is scaled but not the shockwave. But I would expect the shockwave from Charged Staff to also not be scaled by it.

Which one is a bug: Charged Staff missing tooltip or the fact that it scales with Melee increases and it should not?