I think it's both. Maguire's pass was bad. Fred's touch was bad. I'd lean on it being more on Fred because a better player takes control of that, and then bollocks the defense for that pass. You'd naturally expect your centre midfielder to have a better touch.
But I do agree with
@Lentwood. There was a clear agenda against Maguire. Goal wasn't even his fault. Just an excellent goal. Felix came from his blindside and conjured up a special finish.
And I thought blaming Maguire for Rashford's form was laughable. Rashford gets afforded a lot of protection from the footballing media. I do wonder why, sometimes....