v3.2.6

I need more time to publish the customer as a variable directly, so I can pass an Object.

Otherwise, you could have mixed syntax inside the mail view. Meaning that some values may be reached as array and others as object. I think it's not a good idea to mix those.

Until then: You can reach the customer through $order->customer now as a quick workaround, without breaking changes if introducing the customer as it's own variable.