[Gelöst] Teilweise falsche Zuordnung der Inhalte zu den Sprachen

/**
 * Custom function to bulk update the source language for specified post types
 * 
 * Use a plugin such as Code Snippets or Toolset Types to run one time only
 * 
 * @param string $source_from 	Language code to convert from
 * @param string $source_to		Language code to convert to
 * @param array  $content_types Array of post types to convert, defaults to ['post']
 * 
 * Example: convert the source language of pages from German to English
 * 			wpmlsupp_bulk_update_source_lang( 'de', 'en', ['page'] );
 */

function wpmlsupp_bulk_update_source_lang($source_from, $source_to, $content_types = ['post'])
{
    if (isset($source_from) && isset($source_to) && is_array($content_types)) {

        // switch to current source language and get posts in that language
        $current_language = apply_filters('wpml_current_language', null);
        do_action('wpml_switch_language', $source_from);
        $contents = get_posts([
            'numberposts' => -1,
            'post_status' => 'any',
            'post_type' => $content_types,
			'suppress_filters' => false
        ]);

		foreach ($contents as $content) {
			// what's the trid for this content
			$wpml_element_type = apply_filters( 'wpml_element_type', $content->post_type );
            $trid = apply_filters( 'wpml_element_trid', null, $content->ID, $wpml_element_type );

			// get all translations with this trid
            $translations = apply_filters('wpml_get_element_translations', null, $trid, $wpml_element_type);
			
			// iterate over translations with this trid and update source_language_code as required
			foreach ($translations as $lang => $translation) {

				$set_language_args = array(
					'element_id'    => $translation->element_id,
					'element_type'  => $translation->element_type,
					'trid'   => $trid,
					'language_code' => $translation->language_code
				);
				
				if ( $lang == $source_to ) {
					$set_language_args['source_language_code'] = "NULL";
				} else {
					$set_language_args['source_language_code'] = $source_to;
				}
				do_action( 'wpml_set_element_language_details', $set_language_args );
			}
		}
    }
}

add_action('init', function() {
    wpmlsupp_bulk_update_source_lang('de', 'en', ['page']);
});