🐛 Google Analytics 4 Related Bug: Session Attributed as Unassigned for GA4

### Description

After installing the GA4 since last month, we figured out that most of our traffic channel group fell under the "Unassigned" attribute. Compare to previously in the GA3, the user was attributed properly as "google" traffic.

When we tried to access the page for the first time, the channel group is attributed as "google". Our hypothesis for now is if the session is timeout, amp-analytics for GA4 cannot attribute back to the first channel group when user visit the website.

### URL where we can debug and reproduce the problem

https://www.google.com/amp/s/iprice.my/computing/

### Reproduction Steps

- Visit the iprice website from the google
- click on any link from iPrice
- Observe the GA dashboard, user attributed correctly from "google"
- when the session timeout, seems new session attributed as "Unassigned"

### Relevant Logs

_No response_

### Browser(s) Affected

Chrome, Firefox, Safari

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_