I don't think you can do that. Multi tag injection should not happen. Most likely something in between (WAF / load balancer) removed the "X-OneAgent-JS-Injection" header.
Thank you Julius.
Guys were experimented with manual tagging (with defer mode) - and it was maybe reason for it - ingress Nginx added probably another tag (Kubernetes envoronment) .
Means if manual tagging will happen - then "X-OneAgent-JS-Injection" header should be included ? Which value header should contain ?
Java script tag injection has nothing to do with Dynatrace tagging (Dynatrace manual or auto tags).