During the Patch 9.1 PTR, we noticed a change to the Plaguefall dungeon just over 6 months ago. This change involved the majority of Rigged Plagueborer being removed and being replaced.
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Blizzard has provided some insight on the design decision of powerful dungeon-specific effects in Mythic+ such as why Plaguefall's Plagueborers were removed in Patch 9.1, Necrotic Wake weapons and Tol Dagor cannons.