Show Pages in Categories

Have you try:

function my_custom_show_pages_in_category( $query ){
     if( $query->is_category() && $query->is_main_query() ){
           $query->set('post_type', array('post', 'page' ) ) ;
     }
}
add_action('pre_get_posts', 'my_custom_show_pages_in_category' );

See more: Codex

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