Hey there. Vex Mythoclast was introduced into Destiny 2 in May 2021 when the reprised version of Vault of Glass was added. I do not see any Vault of Glass completions on your account, so you could not have earned it in Destiny 2, especially if you have been inactive for at least 2 years.
You are possibly thinking of your playtime in the original Destiny.
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EckyThumpにより編集済み: 9/21/2022 9:32:51 AMHeya. Vault of Glass was added to Destiny 2 in May 2021. [i]It was not possible to earn, own, or use Vex Mythoclast in Destiny 2 before this.[/i] Nothing has disappeared. You are probably thinking about the original Destiny.