Game adjudicated incorrectly (dead position)

Here is the game: lichess.org/oOWDMTyn

My flag fell and there is no legal sequence of moves that leads to checkmate for my opponent, therefore it should be a draw according to the FIDE Laws of Chess.

I note that lichess does follow the FIDE Laws in positions such as K+B vs K+B. It seems like a bug that the laws are not consistently applied.

"there is no legal sequence of moves that leads to checkmate for my opponent"

False.

"it should be a draw according to the FIDE Laws of Chess"

False.

"lichess does follow the FIDE Laws in positions such as K+B vs K+B"

False.

@Chessty_McBiggins White's only possible move results in a insufficient material position. This should actually be a draw according to FIDE rules.

My best guess is that Lichess just correctly recognized K+N vs. K+R as a setup that can result in checkmate while simultaneously failing to acknowledge the forced simplification in this particular position.
Bad luck indeed.

@Chessty_McBiggins, can you show a legal sequence of moves leading to mate?

Should be a draw.

This would only be correctly adjudicated if there was an instance of Stockfish "watching" the game, but that would be impractical to implemet. Tough luck, though I wouldn't say that Lichess is really "at fualt" here (nobody is). It's just one of those exceptions to the rule that K+R v K+N is winnable for the side with K+R

The answer is in this thread:
lichess.org/forum/game-analysis/outrageous-how-can-white-be-victorious-here-?page=1
These threads should be merged.

@hangrad No, the answer is not in that thread. Taking a look at the final position of the game can help you see no side has a sequence leading to checkmate. I'd like to see @Sarg0n in this thread, though.

@savagechess2k you have a thread where you ask how to improve on endgames.
lichess.org/forum/general-chess-discussion/how-to-get-better-at-endgames?page=1
I suggest you read some guides online and in chess books. Then set up some positions and practice against highest level Stockfish. Knowledge of endgames decides many chess games under slow time controls. In fast chess games, blunders are far more common and you do not need endgames as much.