Aspect of War Intercepting Bug

Aspect of War states that intercepting the AI's heavy attack nullifies its Unstoppable buff. I just tried this against Venompool on Unollected in Enter the Cabal 3.1. I evaded the Venompool's 1st heavy attack hit and then used a light attack to intercept him before his 2nd heavy attack hit finished. I landed the hit but Unstoppable was not nullified. Does this mean we can only intercept with medium attacks?
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https://forums.playcontestofchampions.com/en/discussion/85219/potential-aspect-of-war-bug#latest
@ShadPrince Great post. The bug doesn't discriminate. Can we get some insight on this @Kabam Miike?