is one piece episode 854 filler?

Brûlée finds another mirror leading to the Sunny, and Mascarpone and Joscarpone prepare to shoot flaming arrows into it. However, the Sunny crew quickly gets to work locating and breaking all the remaining mirrors on the ship, and the Big Mom Pirates are shocked as they shatter.

Mascarpone and Joscarpone think that the Sunny sunk into the ocean which caused the mirrors to shatter, but Brûlée is suspicious about it. Luffy notices the mirrors shattering, and catches Chopper on the other side of the mirror shard in his possession.