Hey Blizzard,
since Reforged it is not possible to have Special Effects on the Headhunter V1 alternate model (i.e. the Berserker not the basic Headhunter) if you attach them to the “Chest” attachment point. For example i tried to attach the Aerial Shackles FX but it’s not visible. I also tested it in Warcraft 3 patch 1.26 where it works properly. Furthermore I imported the 1.26 model into my map and tried again to attach an Special effect to the chest attachment point but yet again it is not visible. So probably this is not a bug in the model itself.
Would be neat if you could fix this in the upcoming patch. Thank you.