RHEL8: no_balance_cores in tuned cpu-partitioning profile may not work

Issue

The following options are set in activated cpu-partitioning tuned profile:

isolated_cores=<isolated_CPUs_list>
no_balance_cores=<isolated_CPUs_list>

If a multi-threaded task or a task with a lot of subtasks is executed in the system like this:

taskset -c <isolated_CPUs_list> ./task

or

taskset -c <all_CPUs> ./task

then all threads or childs (including the main process) are able to migrate within allowed CPUs affinity despite manual for tuned-profiles-cpu-partitioning says:

       no_balance_cores=<CPU-LIST>
              List of CPUs not be considered by the kernel when doing system wide process load-balancing. Usually, this list
              should  be the same as isolated_cores=. This option is optional.