Dolby Atmos Renderer looses connection to objects after recall of a static mixer snapshot

I am working on a small 10 track Dolby Atmos project in Cubase Pro 13.04.41 on a Windows 10 machine with all the latest updates.

After opening the Cubase project, I realized that the pan position of the VST Multi Panner in several tracks had changed without any reason. I could play back the project audio through the Dolby Atmos bus, though. After recalling the latest snapshot, I discovered that there was no audio signal played back any more. The Dolby Atmos bus was dead and no audio signal level visible .
I discovered that all source channels in the ADM Authoring settings were no longer connected with objects. I had to reconnect each track / object manually in the ADM Authoring window to route my audio accordingly.
I have uploaded screenshots illustrating the situation. Is this known, or am I doing something wrong here?
Many thanks in advance.
Heiko