Behavior of resumable tasks and task arenas

[CCT825]

Hi,

I have encountered a problem with version 2022.2.0 (and older) when using resumable tasks that task arenas were not getting any worker threads.
I have boiled it down to the following reproducer:

  #include <oneapi/tbb.h>
  #include <iostream>

  int main(){
    using namespace oneapi;
    auto concurrency = std::thread::hardware_concurrency();

    auto arena_bg = tbb::task_arena(tbb::task_arena::automatic);
    auto arena_fg = tbb::task_arena(tbb::task_arena::automatic);
    
    auto job = [&]() {
        arena_fg.execute([&]() {
            tbb::task::suspend([&](tbb::task::suspend_point suspend_point) {
                arena_bg.enqueue([&, suspend_point]() { 
                    std::cout << "If you can read this, all is fine\n";
                    tbb::task::resume(suspend_point);
                });
            });
        });
    };

    tbb::task_group jobs;
    for (unsigned i = 0; i < concurrency; i++)
        jobs.run(job);
    jobs.wait();
   
    return 0;
  };

The reproducer is not reliable. Sometimes it terminates fine, sometimes it deadlocks as tasks enqueued in bg_arena are never executed.
So I am unsure what is expected behavior should be: Are the worker threads resulting from suspended tasks still bound to the original arena or should they seek work in any arena?