This has happened to me with swords multiple times recently, too. Not sure what the deal is.
Are you aware that you only have to solo the dungeon and then have a flawless run that doesn't have to be solo? Everyone does have to complete it flawlessly, but you don't have to do it by yourself.
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I am aware but it's just easier to so it by myself so I don't have multiple factors of screwing it up or someone getting super unlucky.