I have a sitepackage with V13.4 that's working. Now I have created several container elements. I can use them and also rendering is OK,
but as soon as I use a container-element my meta-tags and CSS-includes move from to .
Deleting the container-element, everything is fine again.
I have definded the TCA Overrides, the typoscript, the templates, all of that in Configuration/Sets/SitePackage/...