Bin ins gleiche Problem reingelaufen.
Quick fix kann in includes/gateway/class-wc-swiss-qr-bill-generate.php in Zeile 266 gemacht werden.
alt:
$order->get_billing_company() ? $order->get_formatted_billing_full_name() . ', ' . $order->get_billing_company() : $order->get_formatted_billing_full_name(),
neu:
$order->get_billing_company() ? $order->get_formatted_billing_full_name() . ', ' . strlen($order->get_billing_company(), 0, 50) : $order->get_formatted_billing_full_name(),
Scheint keine Nebenwirkungen zu haben 😉