In my journey triumph tracker the Snowball Specialist is stuck even though the event is ended. I cant remove it even though that it is at 100%.
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Its a longstanding issue. Bungie implemented a change back in Season of the Haunted that would reset tracked items with a season launch, but that sometimes doesn't work. Can you check on the seal and the Journey page, to see if either have the option to untrack? if they don't then unfortunately you'll likely be stuck until the above mentioned reset happens and hopefully it works for you.