Bastian,
Thank you for your feedback. I’m pretty sure the loading order of the different packages is the culprit. We have seen the same during our tests but have found no real solution, even without the recommendation from ASOBO/MS.
I think this loading system is still buggy, even in the SU1 beta. The old system via the content.xml file was much more transparent and easier to understand.
We will see if ASOBO/MS offers us any deeper information on this in the future.
Thanks again for your input here, and please don’t hesitate to contact us again whenever you have a question.
Schönen Abend 
Richard