When I upload the app.war.original from a 3.2.8 app to a tomcat7 or tomcat8 running on a java 1.8.0_51 server, assets are not included in my source, as if the asset:stylesheet and asset:javascript tags didn't exist in my layout.
The app is running fine with :
java -D"grails.env"=prod -jar .\build\libs\app-x.y.z.war