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If you un-comment the print_exc() call, you'll see that it still fails - for queue.Queue:
Manager failure (for Queue)
Traceback (most recent call last):
 File "fish.py", line 74, in main
 add_type_in_own_process(mgr, type_name)
 File "fish.py", line 61, in add_type_in_own_process
 use_manager(obj, type_name, mgr=mgr)
 File "fish.py", line 35, in use_manager
 obj.append(getattr(mgr, type_name)())
 File "<string>", line 2, in append
 File "/usr/lib/python3.8/multiprocessing/managers.py", line 850, in _callmethod
 raise convert_to_error(kind, result)
multiprocessing.managers.RemoteError: 
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Traceback (most recent call last):
 File "/usr/lib/python3.8/multiprocessing/managers.py", line 243, in serve_client
 request = recv()
 File "/usr/lib/python3.8/multiprocessing/connection.py", line 251, in recv
 return _ForkingPickler.loads(buf.getbuffer())
 File "/usr/lib/python3.8/multiprocessing/managers.py", line 959, in RebuildProxy
 return func(token, serializer, incref=incref, **kwds)
TypeError: AutoProxy() got an unexpected keyword argument 'manager_owned'
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