"Blind" lichess engine and funny perpetual checkmate

Sorry, can't edit topic title. It should be "Funny perpetual check" of course

Hello everyone! Please enjoy funny ending of the game there and answer please the following question:

Why lichess engine recommends move 20.Rh3 when Queen sacrifice played by me is obviously the best move?
Thank you

Because it has to calculate 25 halfmoves deep to see that a repetition is unavoidable. Until then it's just a queen sacrifice for a pawn and some checks. It does see it eventually, but probably not without enabling infinite analysis.

Nice sacrifice!

i suppose it also depends on your computer on mine it does see it actually