I just updated to Backlight 5 (and all add-ons) today and was having an error issue pertaining to Imagick. This info is probably helpful for others where the Imagick module can’t find the path to PHP.
This issue has been resolved and my host said that the PHP module Imagick has not been updated by cPanel to use PHP 8.1. So, by running PHP 8.0 you go to look at your modules and Imagick is; in fact, one of the ones listed there in cPanel. Going back to PHP 8.0 solved my problem.