(Richard Heathcote/Pool via AP)Manchester United began its Premier League campaign with a performance as disjointed as its offseason. Maybe the 3-1 home loss to Crystal Palace on Saturday shouldn’t really have come as a surprise. After all, United only ended a pandemic-prolonged 2019-20 season 33 days ago with a demoralizing loss to Sevilla in the Europa League semifinals. “We knew Manchester United didn’t play last week and that we had the mental advantage,” Palace winger Andros Townsend said. On a day when 21 goals were scored in four games, there were also wins for Everton, Leeds and Arsenal.