Thetvdb supports three orders for episodes: Aired/DVD/Absolute. Unless I’m mistaken Infuse supports only Aired Order. I have anime episodes in absolute order. So “One Piece 381.mkv” has to be manually looked up in thetvdb and renamed to “One Piece S12E56.mkv”.
It would be great if Infuse supported Absolute Order, for example super-easy by using a special folder:
root\One Piece\Absolute Order\blabla 381.mkv