Font rendering not working with low font size

As usual, I’m working with DirectX in MonoGame.

I just checked out the latest develop branch and got the latest versions of the content builder, and the framework itself. I created a spritefont using Calibri as fontname, and set the fontsize to 16, the result is as follows:

Nothing wrong here.

Now I set the font size to 11, and rebuilt it. The result:

I’ve tried different fonts, some work, most don’t. I’ve tried the stuff mentioned here in the comments:
Which did not work.

Any suggestions on how to fix this?

Have you tried different TextureFormats? (Color/DxtCompressed/Compressed)

I just tried to recompile using all different texture formats. None of them worked, they all resulted in the same deformed font picture shown above.