Unable to equip certain assets with HumanoidDescription

Hello. I’m having issues equipping certain assets with the HumanoidDescription system.

I’ve made an in-game avatar editor that simply interacts with HumanoidDescriptions, it works perfectly. However, when you try to add an event item (Metaverse items, Crown of O’s, Zara Larsson items used to not work, but they do now), you get this warning:
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I have absolutely no idea what to do about this, since I don’t want to implement an entirely different asset equipping system just because a few stubborn assets refuse to be added to your character.

This is very frustrating as I can equip the items to my character using the Roblox avatar editor, but for seemingly no reason at all, I cannot equip them using HumanoidDescriptions. This makes making or editing outfits with these items in-game impossible even if you already have them equipped on your Roblox character.

Any help would be appreciated. Thank you!