Appsflyer. The conversion data doesn't come to TWA.

I have created an app using Bubblewrap, with the enabled feature of Appsflyer – it's needed to receive the google play referrer information.

But I have kind of unexpected behaviour:

When I launch the app the following happens: on open the app opens a url with the `appsflyer_id` query parameter.
I.e. the following url is being opened: https://angus.surge.sh/?appsflyer_id=xxxxxxxx. However, it doesn't receive any cookies in response afterwards as expected according to Appsflyer documentation.

Screenshot №1 + source URL: https://support.appsflyer.com/hc/en-us/articles/360002330178-Using-AppsFlyer-with-TWA#append-appsflyer-id-and-customer-user-id-to-url:

Screenshot №2: expected cookies on the client side (the same source as Screenshot №1):

And this is my source code: https://github.com/LupusX5/twa-demo

Could you please help solve this issue?