Hi @philipp
Your first step is to debug variables:
<?php
// test field
$post_objects = get_field('snippet_list');
echo '<pre>';
print_r( $post_objects );
echo '</pre>';
die;
//test post_id
global $post;
echo '<pre>';
print_r($post->ID);
echo '</pre>';
die;
?>
Are these variables producing the correct data?