从 .Net 4.6.1 升级到 .Net 5 后，为什么 CreateManagedControl 访问冲突？

如何解决从 .Net 4.6.1 升级到 .Net 5 后，为什么 CreateManagedControl 访问冲突？

我有一个 MFC 应用程序，其中包含一个 C++/CLI 项目，该项目调用 MFC::CWinFormsControl<MyWidget>::CreateManagedControl() 来创建用 C# 编写的控件。这在 .Net Framework 4.6.1 下运行良好，但现在我已将 C++/CLI 和 C# 项目升级到 .Net 5，它会导致访问冲突：

Exception thrown at 0x00007FFC81A3F528 (clr.dll) in MyApp.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

堆栈跟踪：

mfc140ud.dll!COleControlSite::CreateControlCommon(CWnd * pWndCtrl,const _GUID & clsid,const CControlCreationInfo & creationInfo,const wchar_t * lpszWindowName,unsigned long dwStyle,const tagPOINT * ppt,const tagSIZE * psize,unsigned int nID,CFile * pPersist,int bStorage,wchar_t * bstrLicKey) Line 224 C++
mfc140ud.dll!COleControlSite::CreateControl(CWnd * pWndCtrl,unsigned int nID) Line 198  C++
mfc140ud.dll!COleControlContainer::CreateControlCommon(CWnd * pWndCtrl,wchar_t * bstrLicKey,COleControlSite * * ppNewSite) Line 301 C++
mfc140ud.dll!COleControlContainer::CreateControl(CWnd * pWndCtrl,unsigned int nID) Line 270 C++
mfc140ud.dll!CWnd::CreateControl(const CControlCreationInfo & creationInfo,CWnd * pParentWnd,unsigned int nID) Line 90    C++
[Managed to Native Transition]  
CLI.dll!Microsoft::VisualC::MFC::CWinFormsControl<Widget::MyWidget>::InternalCreateManagedControl(CControlCreationInfo& info,unsigned int dwStyle,tagRECT& rect,CWnd* pParentWnd,int nID) Line 122  C++
CLI.dll!Microsoft::VisualC::MFC::CWinFormsControl<Widget::MyWidget>::CreateManagedControl(System::Type^ pType,int nID) Line 133 C++
CLI.dll!Microsoft::VisualC::MFC::CWinFormsControl<Widget::MyWidget>::CreateManagedControl(unsigned int dwStyle,int nID) Line 149  C++
CLI.dll!Cli::CreateControl(CWnd* parent,int id) Line 191   C++

其他 C# 功能可以顺利运行，实验性 gcnew Widget::MyWidget() 也是如此。我一直在尝试项目设置，但一无所获。有什么想法吗？