最近在改 selenium+unittest 的 UI 自动化测试项目，用 pytest 代替 unittest，现在遇到个问题，pytest 结合 allure 使用
比如我有 2 个测试用例，我使用 pytest 的并发测试的插件 pytest-xdist，命令:pytest -n auto -m form，同时跑 2 个用例，这样子没有问题，不会报错，全部跑完会提示运行了 2 个测试用例，耗时多久。
但当我结合 allure 的时候，命令:pytest -n auto -m form --alluredir=UIreport，每次用例跑完（很奇怪，就是最后一个用例跑完后，本来应该关闭浏览器的，但他就是不关），然后提示我只运行了 1 个测试用例，中间会报错，报错如下

DevTools listening on ws://127.0.0.1:52495/devtools/browser/d45e5c01-e7d7-4af7-b035-d9043a14f6c3

DevTools listening on ws://127.0.0.1:52497/devtools/browser/a2178afe-099d-458b-8e3b-81ff683ef97d
.INTERNALERROR> Traceback (most recent call last):
INTERNALERROR> File "c:\python3\lib\site-packages_pytest\main.py", line 209, in wrap_session
INTERNALERROR> session.exitstatus = doit(config, session) or 0
INTERNALERROR> File "c:\python3\lib\site-packages_pytest\main.py", line 249, in main
INTERNALERROR> config.hook.pytest_runtestloop(session=session)
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\hooks.py", line 289, in __call_
INTERNALERROR> return self.hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\manager.py", line 68, in _hookexec
INTERNALERROR> return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\manager.py", line 62, in
INTERNALERROR> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\callers.py", line 208, in _multicall
INTERNALERROR> return outcome.get_result()
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\callers.py", line 80, in get_result
INTERNALERROR> raise ex[1].with_traceback(ex[2])
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\callers.py", line 187, in _multicall
INTERNALERROR> res = hook_impl.function(args)
INTERNALERROR> File "C:\python3\lib\site-packages\xdist\dsession.py", line 115, in pytest_runtestloop
INTERNALERROR> self.loop_once()
INTERNALERROR> File "C:\python3\lib\site-packages\xdist\dsession.py", line 138, in loop_once
INTERNALERROR> call(*kwargs)
INTERNALERROR> File "C:\python3\lib\site-packages\xdist\dsession.py", line 244, in worker_logfinish
INTERNALERROR> self.config.hook.pytest_runtest_logfinish(nodeid=nodeid, location=location)
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\hooks.py", line 289, in __call_
INTERNALERROR> return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\manager.py", line 68, in _hookexec
INTERNALERROR> return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\manager.py", line 62, in
INTERNALERROR> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
INTERNALERROR> File "c:\python3\lib\site-packages\pluggy\callers.py", line 203, in _multicall
INTERNALERROR> gen.send(outcome)
INTERNALERROR> File "c:\python3\lib\site-packages\allure_pytest\listener.py", line 205, in pytest_runtest_logfinish
INTERNALERROR> uuid = self._cache.pop(nodeid)
INTERNALERROR> File "c:\python3\lib\site-packages\allure_pytest\listener.py", line 261, in pop
INTERNALERROR> return self._items.pop(str(_id))
INTERNALERROR> KeyError: 'test_form_002.py::TestForm002::test_form_002'

====================================================================== 1 passed in 86.58 seconds ======================================================================

我其实运行了 2 个（浏览器都打开了，步骤都跑了），但他只说运行了 1 个，然后报告里就只显示 1 个用例的报告，求教怎么解决 pytest 结合 allure 并发测试的这个问题？这个 keyError 我百度了好久，Stack Overflow 上也没有答案