API orders with tax_lines on an order from Australia even if there is no tax rate defined on country

Shopify Discussion
1

First of all, my Settings are:

Taxes and duties: Include sales tax in product price and shipping rate [checked]

Markets: Include or exclude tax based on your customer’s country [disabled]

I have not defined any VAT on any country

When my orders API imports an order from USA or UK or Taiwan the tax_lines collection on order line_items is always empty.

When my orders API imports an order from Australia now I get this on my line_items:

"tax_lines": [{
                            "channel_liable": false,
                            "price": "0.00",
                            "price_set": {
                                "shop_money": {
                                    "amount": "0.00",
                                    "currency_code": "EUR"
                                },
                                "presentment_money": {
                                    "amount": "0.00",
                                    "currency_code": "EUR"
                                }
                            },
                            "rate": 0.1,
                            "title": "GST"
                        }
                    ]

Why?

I cannot undestand the cause of the difference since it’s just the same situation of orders coming from USA, UK, Taiwan…

How can I get empty tax_lines also on orders from Australia?

Thank You