@Steve Giller I have a similar issue, usually the tasks are assigned to a team, but the team members cannot reassign to another team the task.
this usually happens when a team escalate the request to another team, all the created tasks cannot be edited and assigned to the new team, unless it is assigned to a specific Owner.
It seems like there's no more the possibility edit the task assignment vs another team, while I'm sure this was available some time ago (couple of months maybe not more )