Can I refund won game or is it a bug?

I just played the game where we left with almost zero pieces and just before I ate the last pawn, opponent resigned. We got plenty of time, and I just planned to eat the last one, but game suddenly stopped. There's no way I could win it - I didn't have any pieces left, if opponent would lost on time it would still count as draw if Im not mistaken. Doesn't feel right to be a winner in that situation, so is it a bug or is there a way to refund the game?

lichess.org/9pLcQsdt/white

How is it a bug that your opponent made an intentional decision to forfeit the game?
Refunding the game would go against the intentions and actions of your opponent.

I believe this is one of the rare cases where FIDE and Lichess operate different rules when that isn't strictly necessary. It would have been a draw in a FIDE event but Lichess doesn't implement that because it would happen so rarely. Interesting that it has in fact happened here. Probably the resignation was in error. I've done that before: resigned when I intended to offer a draw. I misinterpreted the white flag icon as a "peace" symbol. Embarrassing!

A discussion on the rule Brian-E refers to in comment #3 is e.g. lichess.org/forum/general-chess-discussion/can-draw-be-by-resignation

An interesting note is that this exception in article 5.1.2 is present only in the newest version of FIDE rules valid since 2023-01-01. In previous version valid until 2022-12-31, there was only "The game is won by the player whose opponent declares he resigns. This immediately ends the game."