pWnd read access violation on Windows version 20H2 - c++

Question

I am running into a very strange issue with my mfc c++ program on newer Windows 10 builds. Specifically 20H2 (Build 19042).
When launching a specific dialog from my main menu PCs running this OS build crash silently, without warning.
I have gained access to dump files and determined the issue to be
"Unhandled exception thrown: read access violation. pWnd -> was 0x33312E" with exception code 0xC0000005
This was thrown inside of wincore.cpp on line 265
IResult = pWnd->WindowProc(nMsg, wParam, lParam);
Looking at the disassembly for this line it fails here...
0053A92C mov eax,dword ptr [pWnd] (pWnd is 0x0019f4a4)
0053A92F mov ecx,dword ptr [eax] (eax is 0x0019f4a4)
(ecx is 0x0033312E)
0053A931 mov edx,dword ptr [ecx+11Ch] (Unhandled exception here)
Call stack looks like this.
Program.exe!AfxCallWndProc(CWnd* pWnd, HWND__* hand, unsigned int nMsg, unsigned int wParam, long iParam) line 265
Program.exe!AfxWndProc(HWND__* hWnd, unsigned int nMsg, unsigned int wParam,long iParam) line 418
user32.dll!__InternalCallWinProc#20()
user32.dll!UserCallWinProcCheckWow()
user32.dll!DispatchClientMessage()
user32.dll!___fnDWORD#4()
ntdll.dll!_KiUserCallbackDispatcher#12()
Program.exe!CWND::UpdateWindow() line 106
Program.exe!CWND::RunModalLoop(unsigned long dwFlags) line 4632
Program.exe!CWND::CreateRunDlgIndirect(const DLGTEMPLATE * lpDialogTemplate, CWnd* pParentWnd, HINSTANCE__ * hInst) line 470
Program.exe!CDialog::DoModal() line 633
Program.exe!CMainDlg::OnDeviceButton() line 1271
Here is the code in OnDeviceButton()
Void CMainDlg::OnDeviceButton()
{
CDevice device;
device.deviceType = 7;
device.DoModal();
}
Here is code from CDevice
BOOL CDevice::OnInitDialog()
{
CDialog::OnInitDialog();
CloseCPC();
deviceList.SetExtendedStyle(LVS_EX_GRIDLINES | LVS_EX_FULLROWSELECT);
deviceList.InsertVolumn(0, _T("Device"), LVCFMT_LEFT, 150);
deviceList.InsertColumn(1, _T("Software Version"), LVCFMT_CENTER. 100);
deviceList.InsertItem(0, _T("BRTB"));
SetupVersionTree();
SetTimer(1,1,NULL);
Sleep(20);
return TRUE;
}
Void CDevice::OnTimer(UINT_PTR nIDEvent)
{
If(nODEvent == 1)
{
KillTimer(1);
If(CPC_handle == -1)
{
InitCPC(7,this);
}
If(firstPass)
{
GetVersion();
}
SetTimer(1,10000,NULL);
}
}
Any ideas? I've run through about everything I can think of for debugging besides submitting a help ticket directly to Microsoft asking for assistance.
If there is any other information I can provide please let me know.
Edit
I forgot to mention "solutions" that I have found.
Initialization if the class object as a pointer
CDevice* device = new CDevice();
A random development version which only difference is a new dialog item. (No longer crashes with this version)
Setting the timer up in InitDialog method after 20ms sleep.
Initializing two CPC msg structures in constructor.
These all individually "resolve" the issue but I cannot seem to find any patterns between these "solutions" and I can't sell them as a solution with the reason of "because it seems to fix it".