[GAMEPLAY] Champions getting attacked while untargetable

Aside from the issues of dying during Alpha Strike, and basic attacks killing right through the counterstrike, a number of other champions are having issues with getting killed by things when they shouldn't be able to.

Can sometimes be attacked during Last Caress.

Can sometimes be attacked during the ascension period of Rappel.

Can sometimes be attacked while getting on his troll pole.

Can sometimes be attacked during Umbral Tresspass, in all three forms.

I have a strong suspicion that multihit effects (such as Shyvana Q, Renekton W, Master Yi passive, and rageblade procs) may be a cause for these bugs.

Side note: All forms of Kayn's Reaping Slash (Q) can be interrupted by charms, and several other non-displacement crowd control effects.