@iwannasee Which version of Luban? Here’s what I see with 3.9.0 and your example.svg
I wonder if this was a bug that was fixed already. There are a couple SVG fixes listed in the changelog. See here: Snapmaker Luban Downloads and Updates
Just mention that because if you’re were looking for the latest version on luban.xyz up until a few days ago it had 3.8.0.
We have run into closed path issues in Illustrator before that result in nearly identical problems to what you were having, but I looked in Illustrator at your file and it looks fine.