Thank you Adam!
In fact, because of what I reported here, I’m not using the built-in Meta tag anymore.
As I’m using a custom code tag to integrate the pixel and other custom codes to send events, the order of these tags matter. With this method, the event tags do not contain the pixel ID, so the pixel has to first be deployed on the page before sending these events.
I’ll be using stg.start. 
Thank you again