🐛 Google Analytics 4 Related Bug: Google Analytics did not send session_start event

### Description

We tried to implement GA4 in the AMP page, but seems the event session_start is not triggered in the page. Compare to our page that implement tag directly.

Our implementation was followed below:
```

{
"vars": {
"gtag_id": "MEASUREMENT_ID",
"config": {
"MEASUREMENT_ID": {
"groups": "default"
}
}
}
}

```

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

https://iprice.my/computing/

### Reproduction Steps

- Try to access the page
- Observed in the realtime report in the GA4
- It didn't trigger event session_start

### 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_