I don’t use bitsy all that much anymore, but I still remember this.
So go to the avatar sprite data, copy the data, add a comma to the last line of the sprite data, then on a new line right after the data, paste the sprite data.
Yea, this dude means transform in a empty room, then kill anyone who goes in said room. They only know that it’s you if you transform in front of them.
I think this has something to do with the size of the window, as this has happened to me when I had the window at half size, but when it was fullscreen it worked perfectly.