Hi there,
I got the data of a polygon and I would like to take a contracted buffer of it by running the workflow below.
However, an extra line appears after creating the buffer.
original polygon

It surprised me when I shrink the polygon by changing multiplier from 0.2 to any other numbers, like 0.21, the line disappears!
It works for all the other polygons so I think the workflow itself should be all right. I wonder if this is just a bug.
Thx for reading and please give me your advice for solving this problem.