is_single() and is_singular() not running the filter on the queried object

gistfile1.txt

/*
 * Test case #1 
 */
 
add_filter( 'the_title', 'my_add_custom_content' );

function my_add_custom_content( $title) {
  if ( is_singular( 'events' ) ):
    $postID = get_the_ID();
    $html = '<a href="#" class="goingLink setGoing" id="'.$postID.'" data-value="'. $postID .'">I\'m Going</a><div id="fb-root"></div>';
    $title .= $html;
  endif;

	return  $title;
}

/*
 * Test Case #2
 */
 
add_filter( 'the_title', 'my_add_custom_content' );

function my_add_custom_content( $title):
  $postID = get_the_ID();
  $postType = get_post_type( $postID );
  if($postType == 'events' && is_single()){
    $html = '<a href="#" class="goingLink setGoing" id="'.$postID.'" data-value="'. $postID .'">I\'m Going</a><div id="fb-root"></div>';
    $title .= $html;
  endif;

	return  $title;
}