Tracking Core Web Vitals in AMP using Google Analytics doesn't work

Description

I added web vitals tracking in code but since then page-views tracking stopped working. Created a test page, please let me know where the issue is.

https://m.economictimes.com/amp_test.cms (PV tracking working) https://m.economictimes.com/amp_test.cms?web_vital=1 (PV tracking not working)

The only difference in the second url is, extraUrlParams has been added to track core web vitals tracking along with page views body as suggested by amp.dev

"extraUrlParams": {
    "lcp": "${largestContentfulPaint}",
    "cls": "${cumulativeLayoutShift}",
    "fid": "${firstInputDelay}"
 }

Reproduction Steps

Please check network log of analytics for the given url. Page views are not getting logged.

Browser(s) Affected

Chrome

OS(s) Affected

Android 11

AMP Version Affected

012105150310000

[abhiz10]

@scaledrop Hi… When you hit this URL

https://m.economictimes.com/amp_test.cms?web_vital=1

Reproduction Steps If you go to another tab and then come back to your original tab analytics data is present in Dev Tool> Network

v=1&_v=a1&ds=AMP&aip&_s=1&dt=%7B%7Btitle%7D%7D&sr=320x568&_utmht=1622481493821&cid=amp-QHLBUAD9Q3EAOfz7PnLBYw&tid=&dl=https%3A%2F%2Fm.economictimes.com%2Famp_test.cms%3Fweb_vital%3D1&dr=&sd=24&ul=en-us&de=UTF-8&t=pageview&jid=0.0021677142480029943&_r=1&a=7210&z=0.9754394625957776&lcp=88.800048828125&cls=0&fid=4

https://amp.dev/documentation/components/amp-analytics/#vars

Variables are resolved asynchronously and can delay the request until they are fulfilled. For example, some metrics such as Cumulative Layout Shift and Largest Contentful Paint are calculated after the page is hidden. For First Input Delay, it is resolved after the user interacts with the page. For this reason these metrics might not be suitable for use with all triggers (for example, on timer or visible).

[scaledrop]

Thank you @micajuine-ho @abhiz10 for your inputs. Closing this thread since we got a another reference of similar open issue