Related Posts: Only return posts in same categories

functions.php

<?php // do not include this line if pasting into an existing php file

// This function will only return posts that are related AND has ALL of the same categories.

function jp_only_rp_in_same_category( $categories, $post_id ) {
  $category_objects = get_the_category( $post_id );
  if ( ! empty( $categories ) ) {
      $categories = array_merge( 'categories', 'category_objects' );
      return $categories;
  }

  else {
    return $category_objects;
  }
}

add_filter( 'jetpack_relatedposts_filter_has_terms', 'jp_only_rp_in_same_category', 10, 2 );

// This one will limit it to a specific category.

function jp_only_rp_in_certain_category( $categories, $post_id ) {
  if ( in_category( 'techy-tips' ) ) { // using a category slug, could be ID, an array of IDs, etc
  $categories = array( get_category_by_slug( 'techy-tips' ) );
  }
  return $categories;
}

add_filter( 'jetpack_relatedposts_filter_has_terms', 'jp_only_rp_in_certain_category', 10, 2 );

hello, I have tried these codes for my wordpress site but it doesn't work. I found some related issues here, it seems Jetpack don't support the filter function now.

Could you please share your current solution about how to return the posts in a same category ?