Special PHP Code no longer works

There is some special code I use for showing pictures on my /tag/ sites. This was originally created by you:

<?php if ( function_exists( 'wppa_albums' ) ) {

// Init
global $wppa;
global $thumbs;
global $photo_count;

// Find the tag
$my_tag = wppa_sanitize_tags( single_tag_title( '', false ) );

// Find the count of photos
$wppa['is_tag'] = $my_tag;
wppa_get_thumbs();
$photo_count = is_array( $thumbs ) ? count( $thumbs ) : 0;

// If photos, show them
if ( $photo_count ) {
echo '<h2 class="entry-title"><b>Galerie-Fotos</b> - passend zu dem Artikel-Schlagwort</h2>';
echo '</br>';
		
//echo do_shortcode( '[wppa type="slide" album="#tags,'.$my_tag.' size="auto" align="center"][/wppa]' );
echo wppa_insert_shortcode_output( do_shortcode( '[wppa type="thumbs" album="#tags,'.$my_tag.' size="auto" align="center"][/wppa]' ) );
}

// If no photos, say it and clean up !
else {
//echo 'Es gibt leider keine passenden Fotos mit dem Schlagwort <b>'.$my_tag.'</b>';
wppa_reset_occurrance();
}
echo '</br>';
} ?>

I don’t know when it stopped working. If I add the shortcode in an empty page it works
using [wppa type="thumbs" album="#tags, ardbeg" size="auto" align="center"][/wppa]

But not with the above code
https://fosm.de/tag/ardbeg/

This code seems to don’t find any pics with the tags. Was there a change with the used functions? Any help is appreciated.