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The answer from the last rules roundup states that the new combiners (Omega Supreme and Skytread) keep all upgrades and damage when they combine. Even with that explanation, rule enforcers where I play tell me that it doesn't apply to the KO'd Skytread's upgrades and that those upgrades are scrapped during the KO process before Revenge combining takes place and do not transfer to the combined Skytread. Can I please get a specific ruling on this?

Upgrades attached to the Skytread half that gets KOd are scrapped at the same time. Those upgrades cant be put on Raider Skytread.
Source: Wizards of the Coast (2019-11-22)    【Link to Ruling】
Tags: Skytread (Plane), Special Ops • Soldier, Skytread (Tank), Special Ops • Soldier, Raider Skytread, Special Ops • Soldier