macOS big sur python3.9 使用 add_config_watcher 函数 TypeError: cannot pickle '_thread.RLock' object

if name == "main":
client.add_config_watcher(data_id, group, test_cb)
import time
time.sleep(3000)

Traceback (most recent call last):
File "/Users/lzh/micro_service/PythonStart/nacos_test/main.py", line 29, in
client.add_config_watcher(data_id, group, test_cb)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/nacos/commons.py", line 10, in synced_func
return func(*args, **kws)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/nacos/client.py", line 519, in add_config_watcher
self.add_config_watchers(data_id, group, [cb], content)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/nacos/commons.py", line 10, in synced_func
return func(*args, **kws)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/nacos/client.py", line 565, in add_config_watchers
puller.start()
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py", line 284, in _Popen
return Popen(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 32, in init
super().init(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_fork.py", line 19, in init
self._launch(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 47, in _launch
reduction.dump(process_obj, fp)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle '_thread.RLock' object

Process finished with exit code 1

Start with nacos/client.py at add_config_watchers and the puller.start() call shown in the traceback. Reproduce the watcher setup on macOS Big Sur with Python 3.9, then identify which process data triggers the RLock pickling error; done means add_config_watcher starts without this TypeError.