KALISTA broken -Auto attack while ressurecting from GA

Pretty much as the title read's my last game I killed Kalista in a team fight and she was auto attacking while she rezzed from Guardian Angel's item effect. She was un-targetable and still killed me. The user also noted noticing she was auto attacking during group chat after the game.. Pretty much lost the game to this glitch hah. Please fix ASAP.

TL:DR Kalista can auto attack while REZing from GA. Thus invincible auto attacks. OP