Yesterday twist causes controversy

Before I begin this is a spoiler free zone.

 

The new Movie Yesterday came out last week, and not everyone is happy with the flick.

The Twist near the end of the Moive has caused some backlash, even causing some people to walk out of cinemas.

Yesterday is a Moive about a man who woke up one day being the only person in the world who can remembers the Beatles. It's set as a silly light hearted flick, but some events in the third act have been labled as quite distasteful. Even causing the Directior to comment saying that when he first seem the script he was unsure about the twist, but i grew on him.

What could the twist be?