Godot version: 3.2.1.stable.official
OS/device including version: Manjaro Gnome, current @ 15 May 2020
Issue description: Adjacent CSG Add brushes start losing triangles when under the same combiner
Steps to reproduce:
As seen in this video https://www.youtube.com/watch?v=KPlKCBz2s38&feature=youtu.be
Minimal reproduction project: Two CSG boxes and a combiner

Can you try 3.2.2 beta 2? It has CSG fixes.
Duplicate of #21125 which was fixed in 3.2.2 with #38011.
@akien-mga Cool. Fixed.
Perfect

Most helpful comment
Can you try 3.2.2 beta 2? It has CSG fixes.