I got a puzzle wrong and can't understand it

Bacon, you didn't notice.
Black Queen could move to b4. )
Queen b4.
So I am a bit confused too with this puzzle.
Bacon, you didn't notice.
Black Queen could move to b4. )
Queen b4.
So I am a bit confused too with this puzzle.
Hi all, I was on lichess and got this puzzle https://lichess.org/training/mHLi8 (sorry I can't paste it in chess.com). I got it wrong and even after seeing the solution I'm kinda confused...
Anyone willing to help? Thanks.