[owl57]

Was it like a temporary assignment to another team? Did the manager at least know what team that was? Or have any idea when the employee is going to return full-time to the tasks of their primary team?

[aliher1911]

Apple uses functional organizational structure. Every product needs a cooperation of all functions to produce results. So engineer on os team working on drivers could be working on driver for the new hw part, but other team members including their manager are not necessarily disclosed on that hw.