Lichess Swiss Last Round marked as absent

lichess.org/swiss/d4nnYRSZ
Me and my opponent played the 12th final round but in standings that game has been marked as absent and neither of us got any point.
Does anyone how and why that happened?

Hi lt grade merit list or pen drive

Hi looose my number to reach out to you

no one to let me know what happened. Is it a bug or any rule i am not aware about