In this theme some controls are not useable, because the colors are incorrect.
You can test it by including the tree and the list controls. For example the Feature Tree has white text on white background in the dark theme.
I attached a screenshot with the "Selection Tree", the "Quick selection tree" looks just like this.
I changed the "Text Style" Property in the dialog, this makes the text readable but the colors (e.g. background, hover style, selected style...) are not for the dark mode.