Error: Class 'Drupal\slick\SlickManager' not found in slick()

Ran into this problem because of PHP 8.1 issues with autoload → , dblog spams some error on any page load, could not find any solution or patch so decided to try alternatives.

Steps:

1. Disable autoload. It causes to disable following modules blazy, blazy_ui, slick, slick_fields, slick_extras, slick_views, slick_example, slick_ui
2. Enable xautoload → , but you can only enable blazy, blazy_ui, you cannot enable slick → , it throws errors:
   
   

   WD php: Error: Class 'Drupal\slick\SlickManager' not found in slick() (line 28 of /htdocs/sites/all/modules/slick/slick.module).               [error]
   Error: Class 'Drupal\slick\SlickManager' not found in slick() (line 28 of /htdocs/sites/all/modules/slick/slick.module).

3. Completely disable and uninstall both autoload and xautoload, enable registry_autoload → latest dev version, as of this post it is 7.x-1.x-dev 2023-Feb-28 version.
4. Try to rebuild registry, both with drush rr and using registry_rebuild. Don't forget to clear caches drush cc all.
5. Attempt drush en blazy, blazy_ui, slick, slick_fields, slick_extras, slick_views, slick_example, slick_ui. All modules install no errors.

There's also another autoloader module that is not documented, but is listed when trying to enable blazy with drush psr0 → .