Hi Snaebjorn,
we have an open case (#00668765) now escalated to PSE.
There is a defect and you can refer to it (TFS 89097).
2 workaround possible:
A: you can create a provisioning task with only a machine as target.
B: create a template that stops before software deployment (it should end with agent installation and reboot) and perform the software distribution as a scheduled task
In the 2nd workaround you can add more than 1 machine per task.
We all are waiting for a fix