Subclass that extends super class and implements interface inspector error - false negative

public virtual class ICInspectorBase {

    public virtual String getFoo() {return '';}

    interface IICInspector {
        String getFoo();
    }

    public class IcInspectorSubClass extends ICInspectorBase implements IICINspector {

    }
}

This simple example is valid APEX as the subclass need not implement the interface methods if its super class has such implementation.

Inspector error on subclass with interface.png

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