Segmentation fault with 6.3.0 on garbage collection

With the release of 6.3.0, we started getting segmentation faults during garbage collection. Our program uses a complicated UI involving user widgets and 3D visualization via VTK, so I don't have an easily reproducible minimal script available. However, here is a link to the failure:

https://dev.azure.com/mne-tools/mne-python/_build/results?buildId=19137&view=logs&jobId=2b5832ae-6860-5681-a4e1-fd132048f8b4&j=2b5832ae-6860-5681-a4e1-fd132048f8b4&t=5b9d2bdb-d99e-53c3-c7bb-7166fe849ae1

And the relevant text:

mne/viz/_brain/tests/test_brain.py::test_brain_gc[pyvistaqt] PASSED [ 18%]Fatal Python error: Segmentation fault 
 
Current thread 0x00007fd3ae76e740 (most recent call first): 
 Garbage-collecting 
 File "/home/vsts/work/1/s/mne/conftest.py", line 403 in garbage_collect 
 File "/opt/hostedtoolcache/Python/3.10.4/x64/lib/python3.10/site-packages/_pytest/fixtures.py", line 899 in _teardown_yield_fixture 
 File "/opt/hostedtoolcache/Python/3.10.4/x64/lib/python3.10/site-packages/_pytest/fixtures.py", line 1012 in finish 
 

 
Basically we have a test that does some 3D plots, then closes our UI, then runs `gc.collect`. This worked on 6.2.4, but on 6.3.0 now segfaults.
 
When I try to reproduce locally, I actually get a segfault somewhere else (earlier than `test_brain_gc`), but I strongly suspect this is also due to garbage collection doing something bad somewhere.
 
Notably, I do not have this issue on PySide6 6.2.4, or on PyQt6 6.3.0:

PyQt6 6.3.0 -- Qt runtime 6.3.0 -- Qt compiled 6.3.0
PySide6 6.2.4 -- Qt runtime 6.2.4 -- Qt compiled 6.2.4

This suggests it's not due to Qt 6.3.0, but rather something specific to PySide 6.3.0's bindings.