I have been playing a lot of Lee Sin recently and i have noticed when i play against a Vayne and she uses her ult to go invisible, even if i hit her with my Q or Tempest it wont reveal her, i don't know if this is a bug (pretty sure it is) or intentional but i hope that people will see this and fix this problem with Vayne and Lee Sin

Ok.

Vaynes ult is not to go invis, but to give her more movement speed and damage, and when she rolls she will go invis for a short duration. You're not suppose to be able to break her invis with damage.

yeah when i hit her with Lee sins E to slow her down and reveal her she just tumbles and it doesnt reveal her, works on pretty much everyone else though