WordPress sent multiple requests on update

I found a solution:

function myAction() {
    if(defined("REST_REQUEST") && REST_REQUEST) {
        return;
    }

    // Do action stuff
}

The request to /wp-json/wp/v2/pages/1373 is a request to the API which defines the constant REST_REQUEST and sets it to true.

If anyone’s got an idea why an extra API request is sent, please feel free to add you answer.

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