At least it works for freshly installing a vm from an OS 27 image, which is better than the official workaround using an additional mac and copying the vm.

Playgrounds puts all files in the sources folder in its own bundle which is implicitly imported, I think.

Thank you for your solution. Unfortunately this is does not give the same result: The Image is not resolution independent as before renderingMode template was necessary to dynamically color the fill pattern. Without using it, you would have to have a image for every fill color. I filed a bug with Apple.