Is ONE PIECE episode 1016 filler?
Canon No, episode 1016 of ONE PIECE is canon.
#1016
The Battle of the Monsters! The Three Stubborn Captains!
怪物決戦! 意地張りあう三船長
Aired 8 May 2022
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.