Azir's soldier not auto attacking

Sometimes when having a soldier on the field, auto attacking does not proc the soldier's animation. I hear the sound effect of the attack and Azir himself does the animation, but the soldier just stands still and doesn't auto attack. No damage is dealt, nothing. Just standing still. Edit: I have also found that Azir's soldier double attack the wards, it happened twice, that when attack a ward with a soldier it takes 2 bars of its health.