Stair and wall SEO issue

[toastish]

Hi all! I'm having an issue with a stair that has a wall on its boundary that is cropped with the stair as the operator with upward extrusion. I would like for the line appearing at the end of the first flight at the bottom of the landing to be gone. This is not the first time this has happened and I would like to know if there is a fix to this problem.

[James B]

@runxel during Beta, let's discuss and assign to me. I'll try to take a closer look. Thanks.