[PySide] The structure of type objects has changed!

[Olivier B.]

I am getting this fatal error when importing PySide2 from a debug
python on windows

Environment :
I build my own python 3.5.2, Qt 5.11.1, and PySide2 5.11.1 (of july
27th), in a release and a debug build,
with the same compiler, VS2015 on windows  and GCC 4.8 on Linux

On Linux, i can import PySide2 with my release and my debug python
On windows, i can do it with the release python, but get the following
error for the debug python

The console says
Fatal Python error: The structure of type objects has changed!
Current thread 0x0000367c (most recent call first):
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 906 in create_module
  File "<frozen importlib._bootstrap>", line 577 in module_from_spec
  File "<frozen importlib._bootstrap>", line 666 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 906 in create_module
  File "<frozen importlib._bootstrap>", line 577 in module_from_spec
  File "<frozen importlib._bootstrap>", line 666 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1016 in _handle_fromlist
  File "C:\...\python-3.5.2\lib\site-packages\PySide2\__init__.py",
line 39 in _setupQtDirectories
  File "C:\...\python-3.5.2\lib\site-packages\PySide2\__init__.py",
line 47 in <module>
  File "<frozen importlib._bootstrap>", line 222 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 665 in exec_module
  File "<frozen importlib._bootstrap>", line 673 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 958 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 969 in _find_and_load
  File "<stdin>", line 1 in <module>

The call stack when it happens, triggered by the import of QNetwork
from __init.py__:39
  python35_d.dll!Py_FatalError(const char * msg) Line 1399 C
  shiboken2_d.cp35-win_amd64.dll!check_PepTypeObject_valid() Line 441 C++
  shiboken2_d.cp35-win_amd64.dll!Pep384_Init() Line 837 C++
  shiboken2_d.cp35-win_amd64.dll!Shiboken::init() Line 554 C++
  shiboken2_d.cp35-win_amd64.dll!Shiboken::Module::create(const char *
moduleName, void * moduleData) Line 81 C++
  QtCore_d.cp35-win_amd64.pyd!PyInit_QtCore() Line 4110 C++
  python35_d.dll!_PyImport_LoadDynamicModuleWithSpec(_object * spec,
_iobuf * fp) Line 150 C
  python35_d.dll!_imp_create_dynamic_impl(PyModuleDef * module,
_object * spec, _object * file) Line 2027 C
  python35_d.dll!_imp_create_dynamic(PyModuleDef * module, _object *
args) Line 282 C
  python35_d.dll!PyCFunction_Call(_object * func, _object * args,
_object * kwds) Line 109 C
  python35_d.dll!ext_do_call(_object * func, _object * * * pp_stack,
int flags, int na, int nk) Line 5032 C
  python35_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 3278 C
  python35_d.dll!_PyEval_EvalCodeWithName(_object * _co, _object *
globals, _object * locals, _object * * args, int argcount, _object * *
kws, int kwcount, _object * * defs, int defcount, _object * kwdefs,
_object * closure, _object * name, _object * qualname) Line 4018 C
  python35_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4818 C
  python35_d.dll!call_function(_object * * * pp_stack, int oparg) Line 4730 C
  python35_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 3238 C
  python35_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4804 C
  python35_d.dll!call_function(_object * * * pp_stack, int oparg) Line 4730 C
  python35_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 3238 C
  python35_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4804 C
  python35_d.dll!call_function(_object * * * pp_stack, int oparg) Line 4730 C
  python35_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 3238 C
  python35_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4804 C
  python35_d.dll!call_function(_object * * * pp_stack, int oparg) Line 4730 C
  python35_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 3238 C
  python35_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4804 C
  python35_d.dll!call_function(_object * * * pp_stack, int oparg) Line 4730 C
  python35_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 3238 C
  python35_d.dll!_PyEval_EvalCodeWithName(_object * _co, _object *
globals, _object * locals, _object * * args, int argcount, _object * *
kws, int kwcount, _object * * defs, int defcount, _object * kwdefs,
_object * closure, _object * name, _object * qualname) Line 4018 C
  python35_d.dll!PyEval_EvalCodeEx(_object * _co, _object * globals,
_object * locals, _object * * args, int argcount, _object * * kws, int
kwcount, _object * * defs, int defcount, _object * kwdefs, _object *
closure) Line 4043 C
  python35_d.dll!function_call(_object * func, _object * arg, _object
* kw) Line 627 C
  python35_d.dll!PyObject_Call(_object * func, _object * arg, _object
* kw) Line 2165 C
  python35_d.dll!_PyObject_CallMethodIdObjArgs(_object * callable,
_Py_Identifier * name, ...) Line 2423 C
  python35_d.dll!PyImport_ImportModuleLevelObject(_object * name,
_object * given_globals, _object * locals, _object * given_fromlist,
int level) Line 1595 C
  python35_d.dll!builtin___import__(_object * self, _object * args,
_object * kwds) Line 215 C
  python35_d.dll!PyCFunction_Call(_object * func, _object * args,
_object * kwds) Line 98 C
  python35_d.dll!PyObject_Call(_object * func, _object * arg, _object
* kw) Line 2165 C
  python35_d.dll!call_function_tail(_object * callable, _object *
args) Line 2191 C
  python35_d.dll!PyObject_CallFunction(_object * callable, const char
* format, ...) Line 2218 C
  python35_d.dll!PyImport_Import(_object * module_name) Line 1800 C
  python35_d.dll!PyImport_ImportModule(const char * name) Line 1263 C
  shiboken2_d.cp35-win_amd64.dll!Shiboken::Module::import(const char *
moduleName) Line 67 C++
> QtNetwork_d.cp35-win_amd64.pyd!PyInit_QtNetwork() Line 1125 C++
  python35_d.dll!_PyImport_LoadDynamicModuleWithSpec(_object * spec,
_iobuf * fp) Line 150 C

What kind of cause could make check_PepTypeObjectValid() to fail?
The proper Qt dlls and PySide pyd files seem loaded from my point of view.