мне помогло
https://wordpress.stackexchange.com/questions/2096...
Replace blog with your category name in the code above.
After adding this code, make sure you go to Settings > Permalinks and click Save to flush the rules cache, or else the rule will not be applied.
/**
* Fix pagination on archive pages
* After adding a rewrite rule, go to Settings > Permalinks and click Save to flush the rules cache
*/
function my_pagination_rewrite() {
add_rewrite_rule('blog/page/?([0-9]{1,})/?$', 'index.php?category_name=blog&paged=$matches[1]', 'top');
}
add_action('init', 'my_pagination_rewrite');