WooCommerce Memberships - Does not assign membership when purchasing a product in a secondary language.

Overview of the issue

If you buy a product in second languages, you will notice that it is not assignment of a membership. You can observe this specifically in the „Thank you“ page that follows the order, where the expected membership details are absent.

Workaround

Please, make sure of having a full backup of your site before proceeding.

• Open the …/wp-content/plugins/woocommerce-memberships/src/class-wc-memberships-membership-plan.php file.
• Look for line 218.
• Replace:

  public function get_product_ids() {
  
  	if ( null === $this->product_ids ) {
  		$this->product_ids = get_post_meta( $this->id, $this->product_ids_meta, true );
  		$this->product_ids = is_array( $this->product_ids ) ? array_unique( array_map( 'absint', $this->product_ids ) ) : [];
  	}
  
  	return $this->product_ids;
  }
  

• With:

  public function get_product_ids() {
  
  	if ( null === $this->product_ids ) {
  		$this->product_ids = get_post_meta( $this->id, $this->product_ids_meta, true );
  		$this->product_ids = apply_filters( 'wc_memberships_rule_object_ids', $this->product_ids );
  		$this->product_ids = is_array( $this->product_ids ) ? array_unique( array_map( 'absint', $this->product_ids ) ) : [];
  	}
  
  	return $this->product_ids;
  }