Shunpo vs gold card.
I believe shunpo has slightly lower range than tf's aa since i can throw the card before she is able to shunpo me. Played several times this match-up.
Then the "bug" itself. I don't know if it's actually a bug but i'll just list it here. If you throw a gold card then she shunpo as fast as she can (hence the range thing), she will jump on you and get stunned like after 0.5s at most. The card would just go to the katarina's position before shunpo then all the way back to hers after shunpo (this being the same as mine, or behind me whatever).
Again, i don't know if this is a bug but remember katarina needs less than 0.1 to kill in you in late game.