Gallery Shortcode problems with multiple tinyMCE editors in 3.5

If you have a metabox with a richtext editor in it, inserted galleries get mixed up.

If I insert a gallery in the main editor, the edit and delete buttons won’t work.
If I insert a gallery in the metabox-editor, it all works as expected.

If there is a gallery in the main-editor AND in the metabox-editor, a click on the edit-icon on the main-editor opens the gallery-modal with the settings of the gallery from the metabox-editor.

Steps to reproduce:
Insert this code into functions.php and then insert a gallery in the editor:

//call our hooks
add_action('admin_init', 'yourplugin_metabox');
add_action('save_post', 'yourplugin_metabox_save');

//return the custom blurb
function yourplugin_secondary_blurb($id = '') {
  $id = (empty($id)) ? get_the_ID() : intval($id);
  $custom = get_post_custom($id);
  return @$custom['secondary_blurb'][0];
}

// add metabox to 'page' post type
function yourplugin_metabox() {
  global $hys;
  if ( current_user_can('manage_options') )
   add_meta_box( 'secondary_blurb_box_id',
   __('Secondary Blurb', 'yourplugin_sec_blurb' ),
   'secondary_blurb_box', 'page' );
}

//secondary blurb metabox HTML
function secondary_blurb_box() {
  global $post;
  echo '<input type="hidden" name="yourplugin_noncename"'.
   ' id="yourplugin_noncename" value="' .
  wp_create_nonce( 'aunqiueyourpluginid' ) . '" />
  <style type="text/css">
  #ed_toolbar { display:none; }
  </style><div>';
  the_editor(yourplugin_secondary_blurb(), "secondary_blurb");
  echo "</div>";
}

// save the secondary blurb value. verify and permission
function yourplugin_metabox_save( $post_id ) {
  global $hys;
  if (!isset($_POST['yourplugin_noncename']) ||
   !wp_verify_nonce( $_POST['yourplugin_noncename'],
   'aunqiueyourpluginid' ))
     return $post_id;
  if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
    return $post_id;
  if ( 'page' == $_POST['post_type'] ) {
    if ( !current_user_can( 'edit_page', $post_id ) )
      return $post_id;
  }
  //save the secondary blurb text if applic..
  if (isset($_POST['secondary_blurb'])) {
    update_post_meta($post_id,'secondary_blurb',$_POST['secondary_blurb']) or
    add_post_meta($post_id,'secondary_blurb',$_POST['secondary_blurb']);
  }
}

Same misbehaviour with meta-box plugins like Rilwis Metabox

NOTE:
This misbehaviour didn’t appear in 3.5 – Beta 3