Capturing a specific window using BitBlt return the black or transparent border which represent the classic gui layer - c++

Question

I tried to capture a screenshot of specific window using BitBlt and save it to clipboard, but it returns the screenshot with the content inside window border only while the window border itself is remain transparent or blacked out with many weird behaviors.
The expected result should be the full window border with the full content:
This is the actual result:
This is what I tried:
Comment the SetLayeredWindowAttributes function before performing BitBlt but the result is the entire black screenshot.
Tried to set the delay after UpdateWindow function but the weird border remains the same.
Disabling some coded option but it didn't help...
Use PrintWindow but the result is the classic gui border, which is not the intended goal (and many article indicate about the problem with this function).
I don't have any idea why this happened nor able to find out due to lack of information of this command when searching Internet.
Is there anything wrong with my code?
void QuickScreenshot()
{
HWND windowHandle(::FindWindowW(0, L"Internet Download Manager 6.41"));
ANIMATIONINFO AnimationInfo{};
SystemParametersInfoW(SPI_GETANIMATION, sizeof(ANIMATIONINFO), &AnimationInfo, NULL);
auto DefaultAnimationInfo(AnimationInfo);
AnimationInfo.iMinAnimate = 0;
DefaultAnimationInfo.cbSize = sizeof(ANIMATIONINFO);
SystemParametersInfoW(SPI_SETANIMATION, sizeof(ANIMATIONINFO), &AnimationInfo, WM_SETTINGCHANGE);
auto originalExstyle(GetWindowLongW(windowHandle, GWL_EXSTYLE));
SetWindowLongW(windowHandle, GWL_EXSTYLE, WS_EX_LAYERED);
COLORREF windowColor;
BYTE windowAlpha, customAlpha(1);
DWORD flag;
WINDOWPLACEMENT windowState{};
windowState.length = sizeof(WINDOWPLACEMENT);
GetLayeredWindowAttributes(windowHandle, &windowColor, &windowAlpha, &flag);
SetLayeredWindowAttributes(windowHandle, windowColor, customAlpha, flag);
GetWindowPlacement(windowHandle, &windowState);
if (windowState.showCmd == SW_SHOWMINIMIZED)
{
if ((windowState.flags & WPF_RESTORETOMAXIMIZED) == WPF_RESTORETOMAXIMIZED)
{
ShowWindow(windowHandle, SW_MAXIMIZE);
}
else
{
ShowWindow(windowHandle, SW_SHOWNORMAL);
}
}
else
{
ShowWindow(windowHandle, windowState.showCmd);
}
RECT windowRectangleCoordinates;
GetWindowRect(windowHandle, &windowRectangleCoordinates);
InvalidateRect(windowHandle, &windowRectangleCoordinates, TRUE);
UpdateWindow(windowHandle);
Sleep(100);
HDC ScreenContentHandle(GetWindowDC(windowHandle));
HDC DestinationContentHandle(CreateCompatibleDC(ScreenContentHandle));
auto cx(windowRectangleCoordinates.right - windowRectangleCoordinates.left);
auto cy(windowRectangleCoordinates.bottom - windowRectangleCoordinates.top);
HBITMAP BitmapHandle(CreateCompatibleBitmap(ScreenContentHandle, cx, cy));
HGDIOBJ oldObject(SelectObject(DestinationContentHandle, BitmapHandle));
//PrintWindow(windowHandle, ScreenContentHandle, NULL);
BitBlt
(
DestinationContentHandle,
0, 0, cx, cy,
ScreenContentHandle,
0, 0,
SRCCOPY | CAPTUREBLT
);
SaveToClipboard(BitmapHandle);
SelectObject(DestinationContentHandle, oldObject);
DeleteDC(DestinationContentHandle));
ReleaseDC(NULL, ScreenContentHandle));
DeleteObject(BitmapHandle));
ShowWindow(windowHandle, SW_MINIMIZE);
SetLayeredWindowAttributes(windowHandle, windowColor, windowAlpha, flag);
SetWindowLongW(windowHandle, GWL_EXSTYLE, originalExstyle);
SystemParametersInfoW(SPI_SETANIMATION, sizeof(ANIMATIONINFO), &DefaultAnimationInfo, WM_SETTINGCHANGE);
}