(Windows) _new() creates invalid Null instance of custom class / crashes in debug build

[TheSHEEEP]

(See this issue for reference)

On Linux the following line of my project works just fine:
https://github.com/TheSHEEEP/godotdetour/blob/master/src/detournavigation.cpp#L394

But on Windows, that _new() (and a couple others as well I assume) produce an invalid Null instance - and using that instance then goes on to cause crashes of course.

That is in a release build. In a debug build, it seems to crash during the _new() itself. Both the class's constructor and _init() function are called and executed without a crash, though.
I really cannot pinpoint where exactly the crash inside the _new() happens in a debug build.

You are of course very welcome to compile and run the demo of the module yourself to see the problem in action.

It is probably something wrong with my code, but given it all works fine on Linux, I'm a bit clueless as to what is going on.

[TheSHEEEP]

As an additional info, I am using the version tagged as "3.2" in git (as it is for a 3.2 project).

[TheSHEEEP]

Digging some further, even an empty custom class derived from Reference (no code other than one test function) will show this behavior, it seems as if on Windows, _new() simply will not produce anything usable.

Could this be an incompatibility between Godot itself and MSVC2017?

Using CustomClass.new() in GDScript works just fine and produces a usable instance, btw. Only in C++, _new() fails.

[TheSHEEEP]

I was finally able to attach a debugger and show where inside of _new() the crash actually happens.
This is the stack trace:

1 Godot_v3_2_1_stable_win64 0x840f57
2 Godot_v3_2_1_stable_win64 0x840ff0
3 Godot_v3_2_1_stable_win64 0x28189b4
4 godot::___godot_icall_bool __icalls.hpp 6224 0x7ffb0efa6014
5 godot::Reference::init_ref Reference.cpp 31 0x7ffb0efa5f5a
6 godot::Refgodot::DetourCrowdAgent::ref_pointer Ref.hpp 33 0x7ffb0eec43b1
7 godot::Refgodot::DetourCrowdAgent::Refgodot::DetourCrowdAgent Ref.hpp 151 0x7ffb0eeb2673
8 godot::DetourNavigation::addAgent detournavigation.cpp 395 0x7ffb0eebd496

The crashing line inside of ___godot_icall_bool is this:
godot::api->godot_method_bind_ptrcall(mb, inst->_owner, args, &ret);

And the values at that point are:

Locals
args @0x433b188 void*[1]
[0] 0x0 void*
inst @0x10b31dd0 godot::Object
[godot::_Wrapped] @0x10b31dd0 godot::_Wrapped
_owner 0xdddddddddddddddd void*
_type_tag 15987178197214944733 unsigned int64
NOTIFICATION_POSTINITIALIZE
NOTIFICATION_PREDELETE
___mb @0x7ffb0f291a10 godot::Object::___method_bindings
mb @0x4b3be00 godot_method_bind
_dont_touch_that "�" unsigned char[1]
'¨' 168 0xa8 unsigned char
ret true bool

[TheSHEEEP]

After some help on the Discord, turns out this problem is known since last year... and there is a fix for it.

Which hasn't been merged in many months.