Everyone was expecting Liverpool to beat Manchester United at Anfield when they played their first match in the Premier League this season, but Liverpool failed to win against Manchester United. I think Manchester United knows how to play against Liverpool this season because they have played each other two times this season, and Liverpool has not had any wins in those two meetings.
Liverpool and Manchester United are known to have loggerheads matches when they meet against each other, which makes a football fan begin to reason why the team(either Liverpool or Manchester United) that was performing badly in the Premier League is beginning to perform better because they are meeting the other.
Manchester United's performance this season is in no way a comparison with Liverpool's Performance, but we had Manchester United win them in their FA Cup meeting. However, I believe that Manchester United knows how to play against Liverpool, which has made Manchester United able to win against Liverpool 15 times, with Liverpool winning them 12 times and 9 draws they have had in their head-to-head matches.
Yes, I agree with you that Manchester United knows how to play against Liverpool. Last season, Manchester United was more in form, and Liverpool won them 7-0 at Anfield. But this season, Liverpool and Manchester United have played twice, and Liverpool have not had any wins in those meetings. For me, it's Manchester United's turn to have better results against Liverpool this season.