[GAMEPLAY] Switching stances with Ult on Jayce makes u incapable of auto attacking

On Jayce, when switching stances with your ult , you get locked in auto stop mode and u can't auto attack for approx 1-2 seconds. I tried to use hammer Q or Canon Q and 90% of the time i can't do anything ( like a stun ) with my abilitys ( NOT SUMMONER SPELLS , THESE HAVE NO PROBLEM CASTING)

1. Switch stance on jayce ( Canon/Hammer )
2. Try to autoattack or use an ability AFAP
3. You stop autoattacking for 1 second then proceed to auto attack or cast te ability

I've tried this over 2 games. It happend 90% of the time after switching a stance. I have used the Full Metal Jayce skin both these games.