Hello, I'm attaching the file so you can verify it.
I enclose an image where I mark the missing line.
If it's a design error, I'll be grateful for your recommendations. I hope you can help me.
OS: Debian GNU/Linux 9 (stretch) (GNOME/default)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.17445 (Git) AppImage
Build type: Release
Python version: 3.7.3
Qt version: 5.9.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Spanish/Argentina (es_AR)