Bug with collection feats showdown in the badlands

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This is listed in the known issues topic:

28.0 Known Issues

Patch 28.0 is now live, and Showdown in the Badlands is on the horizon! As we ride towards glory, we’ve picked up a few bandits (bugs) that we’re tracking here. The following are some of the known issues we’re tracking this patch: [Resolved] [Arena] Flint Firearm’s Battlecry isn’t working in Arena. [Resolved] [Hearthstone] Wicked Whispers isn’t counting as a “discard” effect. [Added 11/7] [Progression] The Catch-Up Packs login reward will be granted upon login after expansion launch, not patc…

@GnomeSayin-11972

[Added 11/14] [Progression] The Showdown in the Badlands Legendary Achievement is stuck at 26/27. Hold your horses on disenchanting Legendary cards–we’ll get this sorted.