Error thumbnail drupal 8

Hello I have a question about drupal I read a blog Install and Supercharge Drupal 8 With OpenLiteSpeed and LSCache! - #2 by arefen - Blog Posts - CyberPanel Community where it explains how to use it but there is a problem with the thumbnails not generated

I have not been investigating and this problem exists only with open lite speed for a long time although I still cannot find a solution