WOOCS - WooCommerce Currency Switcher

The plugin URL: https://marketpress.de/shop/plugins/woocommerce/woocommerce-german-market/

• In file functions.php of your current wordpress theme add next code:
  
  add_action('wp_wc_invoice_pdf_start_template', function( $args ) { remove_all_filters('woocommerce_currency_symbol'); });

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  add_action('wp_wc_invoice_pdf_start_template', function( $args ) {     remove_all_filters('woocommerce_currency_symbol'); });

  
   

Origin: https://pluginus.net/support/topic/regenerating-the-invoice-show-wrong-currency/