[GAMEPLAY] Project Katarina Ult and Syndra E -- pushback stun doesn't affect Katarina

On Project Katarina ult, Syndra is throwing her E pushback stun to stop her. However, none of these affect Project Katarina and she continues spinning.

• Syndra summons Q
• Project Katarina Ults R
• Syndra throws stun E
• Project Katarina continues to spin

This is on ARAM. I tried to find someone to help me replicate this issue but I couldn't. Thanks.