[Gameplay]Blue buff stops attacking master yi

I was practising new jungle routes efficiency with Master Yi when I encountered this bug, when you Q from the bush on the blue buff and proc your passive on the blue buff in his back he seems to be stun for a couple of seconds and if you stop attacking him he just won't attack you back. If you hit him again he will start attack you again. Sometimes he just stop hitting you and you can land some free shots on him. Doesn't seem fair for other junglers.