Swiss Knife – CSS editor bug

Hi,

I am using:
WP 6.0
Oxygen 4.0.1
Swiss Knife 4.0.0
Plain Classes 1.0.7

When using “Advanced Settings tabs on the left side” there are actually 2 different Css Tabs.
The CSS Tab from Swiss Knife is not saving my code, when clicking “Advanced->Custom CSS”, the code is saved correctly. 
The Frontend only shows CSS code applied in “Advanced->Custom CSS”.

Please see video: https://ibb.co/1zVv36S

Thanks
Daniel