Some champs still can activate stun, even on stun-immune nodes. AA is one of them when his neurotoxin expires, but since Dorm is bleed/poison immune, AA can't inflict Neuro either.
Is not a bug. Check the nodes better before starting something.
Is a linked node to more than one champion, not only dormammu. Even if it was only for Dormammu it would still not be a bug
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Is a linked node to more than one champion, not only dormammu. Even if it was only for Dormammu it would still not be a bug