In the latest Dragonflight Beta build, Court of Stars got some buffs to its trash count, requiring significantly more trash to be killed before the Mythic+ dungeon will complete.
Returning Dungeon Changes
Check out all the datamined changes coming to the returning dungeons in Dragonflight Season 1: Halls of Valor, Shadowmoon Burial Grounds, Court of Stars and Temple of the Jade Serpent.