Featured Content limit not working?

I got to work Featured content with tags, however it returns more than the max_posts I’ve declared in the array(), where else can I check this out?

inside my theme setup() function in functions.php,

add_theme_support( 'featured-content', array(
    	'filter' => 'get_featured_content',
	));

outside my theme setup() function,

function get_featured_content() {
    return apply_filters( 'get_featured_content', array(
    	'max_posts' => 3,
    	) );
}

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