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When working to get Mayavi to deal with all classes properly, I got a segfault. The macOS OS-level traceback for pytest tvtk ends up being:

Process:               python3.8 [49631]
Path:                  /Users/USER/*/python
Identifier:            python3.8
Version:               0
Code Type:             X86-64 (Native)
Parent Process:        bash [49188]
Responsible:           Terminal [49185]
User ID:               501

Date/Time:             2020-07-22 16:51:50.203 -0400
OS Version:            Mac OS X 10.15.5 (19F101)
Report Version:        12
Bridge OS Version:     4.5 (17P5300)
Anonymous UUID:        530319EF-AA7E-7A31-4BE7-0B0F7E9D6775

Sleep/Wake UUID:       159D81B3-E5F6-4DB4-A810-C49ABB404825

Time Awake Since Boot: 280000 seconds
Time Since Wake:       100 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       EXC_I386_GPFLT
Exception Note:        EXC_CORPSE_NOTIFY

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff720ac33a __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff72168e60 pthread_kill + 430
2   libsystem_c.dylib             	0x00007fff71fc393e raise + 26
3   libsystem_platform.dylib      	0x00007fff7215d5fd _sigtramp + 29
4   ???                           	000000000000000000 0 + 0
5   libvtkWrappingPythonCore.1.dylib	0x00000001096e71a5 vtkPythonUtil::GetObjectFromPointer(vtkObjectBase*) + 53
6   vtkRenderingContext2D.cpython-38-darwin.so	0x000000011954b444 PyvtkContextMouseEvent_GetInteractor(_object*, _object*) + 132
7   python                        	0x0000000107835020 cfunction_call_varargs + 224
8   python                        	0x00000001078341d7 _PyObject_MakeTpCall + 167
9   python                        	0x000000010796b76d _PyEval_EvalFrameDefault + 46269
... up to 139 frames of Python calls

I can also trigger it with something simpler:

$ python -c "import vtk; vtk.vtkContextMouseEvent().GetInteractor()"
Segmentation fault: 11

I can work around this in Mayavi, but it might be worth digging into the VTK code to figure out why this breaks. It happens on both Linux and macOS in testing.