Why does the stream trade_updates not show the initial order?

Hi, when I listened to the trade_updates stream and then placed an order from the web page (both for paper account), I didn’t see any update coming on the stream. However, when I then cancelled the open order, I saw two updates, one with status ‘new’ but also with ‘cancel_requested_at’ field set, and the other with status ‘canceled’. So basically the stream is passing down the updates to the order, but not the initial order itself. Why is that? Or is there another stream where I should listen for the initial order? Thanks!