So OP got Google to patch a harmless "issue" that could've been used by addon devs to bypass MV3 restrictions. Hope it was worth the $0.
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Let's do a thought experiment: if OP hasn't reported it, what do you think would happen then? Even if different ad blockers would find it later and use it, Google would have still removed this. Maybe they'd even remove extensions that have (ab)used it from Chrome Web Store.
So now it's abuse to make the user's browser do what the user wants, for the user's benefit, to protect the user from, you know, actual abuse.