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Problems with current version of Celery (5.2.0)

With Celery 5.2.0 installed, I get the following cryptic error message when I start the worker:

 -------------- celery@yoga v5.2.0 (dawn-chorus)
--- ***** ----- 
-- ******* ---- Linux-5.14.0-4-amd64-x86_64-with-glibc2.32 2021-11-12 23:18:41
- *** --- * --- 
- ** ---------- [config]
- ** ---------- .> app:         aleksis:0x7f454b855b80
- ** ---------- .> transport:   redis://localhost:6379/0
- ** ---------- .> results:     
- *** --- * --- .> concurrency: 12 (prefork)
-- ******* ---- .> task events: OFF (enable -E to monitor tasks in this worker)
--- ***** ----- 
 -------------- [queues]
                .> celery           exchange=celery(direct) key=celery
                

[ERROR/ForkPoolWorker-1] Process ForkPoolWorker-1
Traceback (most recent call last):
  File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/process.py", line 327, in _bootstrap
    self.run()
  File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
  File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/pool.py", line 289, in __call__
    self.after_fork()
  File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/pool.py", line 421, in after_fork
    self.initializer(*self.initargs)
  File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/celery/concurrency/prefork.py", line 75, in process_initializer
    task.__trace__ = build_tracer(name, task, app.loader, hostname,
  File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/celery/app/trace.py", line 361, in build_tracer
    push_request = request_stack.push
AttributeError: 'NoneType' object has no attribute 'push'
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1] Process ForkPoolWorker-1:
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1] Traceback (most recent call last):
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1]   File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/process.py", line 327, in _bootstrap
    self.run()
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1]   File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1]   File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/pool.py", line 289, in __call__
    self.after_fork()
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1]   File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/billiard/pool.py", line 421, in after_fork
    self.initializer(*self.initargs)
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1]   File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/celery/concurrency/prefork.py", line 75, in process_initializer
    task.__trace__ = build_tracer(name, task, app.loader, hostname,
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1]   File "/home/wethjo/dev/AlekSIS/apps/official/AlekSIS-Core/.venv/lib/python3.9/site-packages/celery/app/trace.py", line 361, in build_tracer
    push_request = request_stack.push
[2021-11-12 23:18:42,058: WARNING/ForkPoolWorker-1] AttributeError: 'NoneType' object has no attribute 'push'

With Celery 5.1.2, the message doesn't appear.