The Mordenkainen's Tome of Foes D&D Beyond sourcebook monster entries for the Sorrowsworn (The Angry, The Hungry, The Lonely, The Lost, and The Wretched) list the damage resistance as "bludgeoning, piercing, and slashing while in dim light or darkness."
The Game Rules monster entries for each of the Sorrowsworn has damage resistance listed as "Bludgeoning, Piercing, and Slashing from Nonmagical Attacks while in Dim Light or Darkness."
I'm away from my books right now so I don't know what it actually states in the actual MToF book for the damage resistance.
The Mordenkainen's Tome of Foes D&D Beyond sourcebook monster entries for the Sorrowsworn (The Angry, The Hungry, The Lonely, The Lost, and The Wretched) list the damage resistance as "bludgeoning, piercing, and slashing while in dim light or darkness."
The Game Rules monster entries for each of the Sorrowsworn has damage resistance listed as "Bludgeoning, Piercing, and Slashing from Nonmagical Attacks while in Dim Light or Darkness."
I'm away from my books right now so I don't know what it actually states in the actual MToF book for the damage resistance.
I can't find anything on DDB about an errata or any reason it would be different.