Access violation when returing object with specific layout on MSVC

Code:
```c++
#include
#include
#include

#include

namespace cobalt = boost::cobalt;

struct ExampleStruct
{
std::string str;
std::uint8_t padding[32];
};

cobalt::task getResult()
{
// error on this return
co_return {};
}

cobalt::main co_main(int /*argc*/, char** /*argv*/)
{
co_await getResult();
// Never displayed
std::puts("Done");
co_return 0;
}

```

Built on Windows 10 64-bit using MSVC 17.9.5 (cl version 19.39.33523 for x64) with following command:
```
cl /Femain.exe main.cpp /nologo /external:IC:\Users\chodorowskip\repo\deps\vc143\boost-1.85.0\include\boost-1_85 /std:c++20 /MD /Z7 /O2 /EHsc /D_WIN32_WINNT=0x0601 /W4 /external:W0 /link /PROFILE /LIBPATH:C:\Users\chodorowskip\repo\deps\vc143\boost-1.85.0\lib libboost_cobalt-vc143-mt-x64-1_85.lib
```

Error
```
Exception thrown at 0x00007FF728E265E1 in main.exe: 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.
```

Error doesn't seem to happen with debug configuration.