Segfault/sigsegv/access violation when disconnecting a signal/slot

@contextlib.contextmanager
def connection(
    signal: qtrio._util.SignalInstance, slot: typing.Callable[..., object]
) -> typing.Generator[
    typing.Union[QtCore.QMetaObject.Connection, typing.Callable[..., object]],
    None,
    None,
]:
    """Connect a signal and slot for the duration of the context manager.
    Args:
        signal: The signal to connect.
        slot: The callable to connect the signal to.
    """

    # if you get segfault or sigsegv here, especially from pyside2<5.15.2, make
    # sure the slot isn't on a non-hashable (frozen will make it hashable) attrs
    # class.  https://bugreports.qt.io/browse/PYSIDE-1422
    this_connection = signal.connect(slot)

    import qtpy

    if qtpy.PYSIDE2:
        # PySide2 presently returns a bool rather than a QMetaObject.Connection
        # https://bugreports.qt.io/browse/PYSIDE-1334
        this_connection = slot

    try:
        yield this_connection
    finally:
        expected_exception: typing.Type[Exception]

        if qtpy.PYSIDE2:
            expected_exception = RuntimeError
        else:
            expected_exception = TypeError

        try:
            # can we precheck and avoid the exception?
            print("before disconnect", signal, this_connection, flush=True)
            signal.disconnect(this_connection)
            print("after disconnect", flush=True)
        except expected_exception:
            pass

Fatal Python error: Segmentation fault

Thread 0x00007f3891c26700 (most recent call first):
  File "/usr/local/lib/python3.9/site-packages/trio/_core/_thread_cache.py", line 61 in _work
  File "/usr/local/lib/python3.9/threading.py", line 892 in run
  File "/usr/local/lib/python3.9/threading.py", line 954 in _bootstrap_inner
  File "/usr/local/lib/python3.9/threading.py", line 912 in _bootstrap

Current thread 0x00007f38aad2b740 (most recent call first):
  File "/usr/local/lib/python3.9/site-packages/qtrio/_qt.py", line 111 in connection
  File "/usr/local/lib/python3.9/contextlib.py", line 135 in __exit__
  File "/usr/local/lib/python3.9/contextlib.py", line 498 in __exit__
  File "/usr/local/lib/python3.9/site-packages/qtrio/_core.py", line 271 in open_emissions_channel
  File "/usr/local/lib/python3.9/site-packages/async_generator/_util.py", line 53 in __aexit__
  File "/usr/local/lib/python3.9/site-packages/qtrio/_core.py", line 295 in enter_emissions_channel
  File "/usr/local/lib/python3.9/site-packages/async_generator/_util.py", line 53 in __aexit__
  File "/usr/local/lib/python3.9/site-packages/qtrio/_tests/examples/test_buildingrespect.py", line 41 in test_main
  File "/usr/local/lib/python3.9/site-packages/pytest_trio/plugin.py", line 252 in run
  File "/usr/local/lib/python3.9/site-packages/trio/_core/_run.py", line 2167 in unrolled_run
  File "/usr/local/lib/python3.9/site-packages/outcome/_impl.py", line 113 in send
  File "/usr/local/lib/python3.9/site-packages/trio/_core/_run.py", line 1241 in guest_tick
  File "/usr/local/lib/python3.9/site-packages/qtrio/_core.py", line 112 in event
  File "/usr/local/lib/python3.9/site-packages/qtrio/_core.py", line 615 in run
  File "/usr/local/lib/python3.9/site-packages/qtrio/_core.py", line 495 in run
  File "/usr/local/lib/python3.9/site-packages/pytest_trio/plugin.py", line 341 in wrapper
  File "/usr/local/lib/python3.9/site-packages/_pytest/python.py", line 183 in pytest_pyfunc_call
  File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.9/site-packages/_pytest/python.py", line 1641 in runtest
  File "/usr/local/lib/python3.9/site-packages/_pytest/runner.py", line 162 in pytest_runtest_call
  File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.9/site-packages/_pytest/runner.py", line 255 in <lambda>
  File "/usr/local/lib/python3.9/site-packages/_pytest/runner.py", line 311 in from_call
  File "/usr/local/lib/python3.9/site-packages/_pytest/runner.py", line 254 in call_runtest_hook
  File "/usr/local/lib/python3.9/site-packages/_pytest/runner.py", line 215 in call_and_report
  File "/usr/local/lib/python3.9/site-packages/_pytest/runner.py", line 126 in runtestprotocol
  File "/usr/local/lib/python3.9/site-packages/_pytest/runner.py", line 109 in pytest_runtest_protocol
  File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.9/site-packages/_pytest/main.py", line 348 in pytest_runtestloop
  File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.9/site-packages/_pytest/main.py", line 323 in _main
  File "/usr/local/lib/python3.9/site-packages/_pytest/main.py", line 269 in wrap_session
  File "/usr/local/lib/python3.9/site-packages/_pytest/main.py", line 316 in pytest_cmdline_main
  File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187 in _multicall
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84 in <lambda>
  File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93 in _hookexec
  File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 286 in __call__
  File "/usr/local/lib/python3.9/site-packages/_pytest/config/__init__.py", line 162 in main
  File "/usr/local/lib/python3.9/site-packages/_pytest/config/__init__.py", line 185 in console_main
  File "/usr/local/bin/pytest", line 8 in <module>