https://www.gamespot.com/articles/destiny-2-update-will-make-malfeasance-quest-easie/1100-6462323/

Bungie has announced two big planned updates for Destiny 2. One of the them, Update 2.0.5, is designed to patch any issues brought up through player feedback, including a concern that the spawn rate for the Ascendent Primeval Servitor--an enemy necessary for earning the Exotic hand cannon Malfeasance--is too low.

In a blog post, Bungie wrote, "During week three of the curse cycle, also known as a full-curse week, the Ascendant Primeval Servitor will have almost the same chance to spawn as any other Primeval. We will also be increasing the chance for the boss to spawn during lesser-curse weeks, but it will still be lower than during a full-curse week."