On custom skin packs, the Equip button disapeard on skin packs

Beaware that this bug is with Custom skin packs, that means packs created by a player creating some files and putting it on the skin packs folder (eg.lang.JSON, skins.JSON Manifest.JSON) on the route:
(\AppData\Local\Packages\Microsoft.MinecraftUWP_~~\LocalState\games\com.mojang\skin_packs)