thank you page liquid template empty order

[myusername]

For my app, on the thank you page at the end of checkout, there is a script like

   '<script src="https://subdomain.domain.com/status?customerID={{ order.customer.id }}&orderID={{ order.id }}&shopname={{ shop.domain }}&email={{ order.customer.email}}&firstname={{ order.customer.first_name}}&lastname={{ order.customer.last_name}}&shipping_method={{ checkout.shipping_method.title }}&order_url={{ order.order_status_url }}">'

which works most of the time. But on a few occassions, it would seem like there isn't an order or at least the information isn't available. On those occassions, I'd get hits like

"GET /status?customerID=&orderID=&shopname=some-shop.myshopify.com&email=&firstname=&lastname=&shipping_method=&order_url= HTTP/1.0" 200

where the fields related to order are empty. Is this a bug on shopify's end? Are there known issues? Or did I miss something?

[channel]

Same for me