I wanted to create inner corners and got an idea on how to do so.
1) I replaced the foreground graphics with background graphics.
2) I layered an invisible foreground on top of the background.
3) I was going to put in inner corners as decorations, but the screen looked like this:
The ice on top if the screen is supposed to look like the ice on the bottom, but instead it looks like I put a lot of squares in delimit mode: none
Am I doing something wrong or is this a bug?