Hello amagi,
wie don't have more than one Client in our tasks and have this problems.
...we only have one task for our complete application-set...because we use a provisioning template to deploy our software, after the os deploy. so i think there is a missunderstanding between us amagi 
Of course we can change our method to deploy our application after the os deploy via individual Software Tasks, but that would be not the fastest and preferd workaround for us.