But then, the ability to choose Debugger in a "Compiler Settings" makes no sense.
As I remember, in earlier versions, the current debugger was selected by selecting the "Build target" to build, and in a "Build Options" the compiler is selected, and in a "Compiler setting" is a debugger defined for that particular compiler.
It is a bit misleading to have separate Build target selection and Debugger selection, along with the ability to set debugger in a "Compiler settings", that has no effect then.