Is ONE PIECE episode 929 filler?
Canon No, episode 929 of ONE PIECE is canon.
#929
The Bond Between Prisoners! Luffy and Old Man Hyo!
囚人の絆 ルフィとヒョウじい!
Aired 19 Apr 2020
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.