Did you update Stockfish's opening book

My fav response as black against the King's Gambit, Falkbeer's counter gambit (2. ... d5) used to be considered not that long ago as an inaccuracy. Now the engine things it's fine - equal, in fact.
Oddly, it now thinks that the King's Gambit (2. f4) is an inaccuracy.

Did you change/update the opening book?

It's always been an inaccuracy meant to give white a quick attack. It's the GM variation of hope chess.

Sorry AlphaZero prefers to play Stockfish without an opening book.