This is. Perhaps the ability is evolving somehow? This is rather strange and seems to change the rules about the ability. He's supposed to dissappear physically in order to enter any photo.
No not necessarily. The only time Cheng xiaoshi disappears when going into a photo is when he claps his own hands. When both of there hands clap then Cheng xiaoshi's body is still physically present. It's shown like that in the live action as well.
i've never seen the live action but they don't do it in the animation either do they?
is this the first time we see cheng xiaoshi physically in the present while he's in someone else's body from the past at the same time? was that an error or am i just reading into it too much?
also yay more fan service thank you :3