BUG: Origin path prefixed to output path

EG: 

    files: {
            src: [
                'build/*.css',
            ],
            dest: 'sass/components/_'
        }

Will output files to sass/components/_build/*.scss

Expected result: sass/components/_*.scss

Destinations can be supplied in full to achieve the original outcome, but it is currently not possible to remove the src path from the destination path.