AMPforWP + Google Analytics Problem of Engagement Time

I am using Google Analytics and since GA-4 arrived on the scene, the Average Engagement Time on the blog is very wrong on all my blogs that use AMPforWP for mobile and desktop. I don’t know where things are going wrong.

I have followed this guide to integrate GA-4 – https://ampforwp.com/tutorials/article/how-to-add-ga4-in-ampforwp/

Google Analytics showing 3 seconds : https://ibb.co/9tDKYh9

Contradicting, I use Google Site Kit Plugin and it shows good engagement time of 30 Seconds or 1 min or above. Check here https://ibb.co/tDMqhMt

The page I need help with: [log in to see the link]