Guys, I think I figured out what happened... They intended to play Powerslave since the beginning, so they put "The Wicker Man" on the setlist just to get through the chinese censorship. Or they first sent a setlist with "Powerslave" written on it, the government didn't approve, so they sent another one with "The Wicker Man", but they were still intending to play Powerslave. Why am I saying this? I saw a short video on twitter of Bruce singing "Tell me why i had to be a Wickerman". I don't know if you can see the video, but here it is:
https://twitter.com/meina_cat/status/724221714196885504/video/1