Pantheon Shield Block Versus Teemo (Blinding Dart / Toxic Shot)

Can someone please explain to me how when Pantheon has his passive up, and blocks Teemo's toxic shot... why the poison still ticks damage? I know the poison shot is an ability, but I have the same complaint with it. I block the shot and then still lose 30% hp from the poison.

Patch notes:

> Historically, the way empowered basic attacks would affect their target if they'd fail to hit (due to Teemo's Blinding Dart, Pantheon's Aegis of Zeonia, or Jax's Counterstrike) has been pretty inconsistent. In some cases they'd do nothing, in others they'd apply crowd control (but no damage) and in a few they'd just ignore the status altogether. We've retooled these to more consistently meet expectations: if one of the following empowered basic attack misses its target, it won't deal any damage or apply any other effects. In cases where this is tied to a buff, that buff will be consumed as well.

I thought Pantheon's passive would block the blinding shot (its blind and DOT dmg) altogether, or at the very least block the damage but still attach the Blind... but it is extremely frustrating playing pantheon where the attack is blocked and my damage still ticks down 30%.

Can someone please explain if this is intended or an oversight?

Other examples are like Vayne's W.... The attack is blocked but the Silver ring is still added.. I haven't tested it, but I'm assuming Nautilus passive would still root.

Each are different, but I wanted to know if these are intended... primarily the Teemo Blinding Dart and his Toxic Shot. I know the patch notes say Empowered attacks which would really just be the Toxic Shot... but I wanted thoughts on both.

Thank you.