Set correct invoice numbers for zero payment invoices

app/Http/Livewire/BillingPortalPurchasev2.php

@@ -597,6 +597,11 @@ class BillingPortalPurchasev2 extends Component
             ->service()
             ->fillDefaults()
             ->adjustInventory()
+            ->save();
+
+            $invoice->number = null;
+            
+            $invoice->service()
                     ->markPaid()
                     ->save();