https://wccftech.com/battle-for-azeroth-patch-8-1-mm-changes-explained/

Blizzard has provided additional context on the recent Battle for Azeroth patch 8.1 MM Hunter changes on the game’s Public Test Realms.

Changes to the Marksmanship spec were implemented through the recent 8.1 PTR build, and Blizzard has now taken to the official World of Warcraft forums to explain these changes.