Hi everybody,
I wanted to give you an update on the password and ID issues:
As you have reported, the problem only exists on Raspbian. Meanwhile I could confirm that it only happens on recent images of Raspbian. As old images with all updates installed behave as intended, I consider this a bug in Raspbian. If it was intentional, they probably would have changed it for updated installations, too.
The observed change is that recent Rasbians no longer have the file /var/lib/dbus/machine-id and the file /etc/machine-id is no longer static, but randomly changed with every reboot.
We will implement a solution on our side, avoiding this dependency on distribution-specific behavior. Please understand that a well-implemented and well-tested update will take a few weeks. Thanks for your patience and support!