Why didn't Berserk activate?

Question

https://replay.pokemonshowdown.com/gen8uu-1324502410

On turn 21 in this replay, my opponent's Nidoqueen knocked my Galarian Moltres below half health using Sludge Wave, but Berserk didn't activate and I didn't get the +1 special attack boost. A few turns later, Berserk still activated for their Galarian Moltres. How come it didn't activate for my Moltres?

Answer 1

Berserk will not activate if the Pokémon's HP falls below half by a move affected by Sheer Force.

This is most likely the reason. Nidoqueen has the ability Sheer Force which it should always run, so this is the reason most likely.

Source: https://bulbapedia.bulbagarden.net/wiki/Berserk_(Ability)