Fix below. Working with WordPress 5.8:
Default WordPress permalink pagination structure is /example/page/number/, so You should change ‘base’ variable to:
‘base’ => get_permalink() . ‘page/%#%’ . ‘/’,
After that You can go to WordPress -> Settings -> Permalinks and click save to refresh permalinks structure.
You will see working pages which load correct fields with pages structure as:
/example/page/2/, /example/page/3/ ….
