We have process admin users in our system with Manager access who are currently

As you observed, the core issue here is that the managers are able to complete tasks that were not assigned to them, which is different from what's described in the documentation. Given that the chart provided in the documentation is incorrect in this regard, this has been reported to Engineering (Ref. AN-40122) to update the documentation, since this is the expected behaviour.

You could have a look at the chart to see if there are other roles that may be suitable for your use case. Keep in mind that the chart is also missing another privilege that exists for the Manager role - Reassign tasks when reassignment is disabled.

Thanks Abhimanyu.

For a use case, are there any developers here with scenarios such as the need for administrative users to have the ability to reassign tasks for groups/departments, but not access some high level type quick tasks - if quick task permissions are assigned dynamically during the process? Since we have a 26,000 user base, we have to allow admin groups the ability to view processes and re-assign tasks, but keep them out of super-admin quick tasks at the same time. If these super-admin quick tasks are assigned dynamically at run time, we will not be able to segregate them with targeted channels on the dashboard. Would there be any suggested methods for this other than manually checking permissions with process design - say on quick task output or on the forms (doesUserBelongToGroup(), etc)?