Unicode error: invalid skip when using the "Build" button

[AndreSacilotto]

Godot version

3.4.3 - 64 bits

System information

Windows 10, AMD Ryzen 5 1600

Issue description

When click the build button in a mono project it outputs a error "Unicode error: invalid skip". I don't know what causes it, but i don't like to see a error showing up every time I need to re-build the solution.

The strange part is that it's only appears when using that button, if I simply hit play the error don't appear.
I also tested in the version 3.3 and the error is also there.

Steps to reproduce

1. Create a new Mono Project
2. Create a new C# script (this is only for creating the solution)
3. Click the "Build" button at top right
4. Look at the Output you should have a "Unicode error: invalid skip"

Minimal reproduction project

New Unicode.zip

[Calinou]

Duplicate of #40576.