STUN IMMUNITY BUG

On the "SHOOTING STARS" event quest Chapter 1: Quest 2: Boss Node "Steady Perseverance" on Gorr states he is stun immune. My problem with this is I used Mantis sleep ability on him and a prompt on Gorr said "Stun Immunity". I died several times and it kept saying the same thing. Send me revives to make up for the false add.
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