Moving fullscreen window from primary to secondary monitor causes visual artifact on primary monitor - c++

Question

I am trying to move a fullscreen window from the primary monitor to the secondary monitor. However, while the window appears as it should on the secondary monitor, it also still appears on the primary monitor. This is just a visual artifact as clicking the 'window' on the primary monitor causes the program to minimize just like clicking outside of a program normally would.
After maximizing the program the function works as intended and is able to move the program between the two monitors problem free.
What is causing this visual artifact and more importantly, how can it be fixed?
This is the code I am using, mostly found through trial and error by looking at what decreases the visual artifacts and what doesn't.
void MoveFullscreenWindowToMonitor(HWND hwnd, HMONITOR fromMonitor, HMONITOR hMonitor) {
MONITORINFO monitorInfo = { sizeof(MONITORINFO) };
if (GetMonitorInfo(hMonitor, &monitorInfo)) {
RECT monitorRect = monitorInfo.rcMonitor;
int width = monitorRect.right - monitorRect.left;
int height = monitorRect.bottom - monitorRect.top;
// Get the current window style
LONG style = GetWindowLong(hwnd, GWL_STYLE);
// Temporarily remove the WS_POPUP style to exit fullscreen mode
SetWindowLong(hwnd, GWL_STYLE, style & ~WS_POPUP);
// Move the window off the screen before moving it to the new monitor
SetWindowPos(hwnd, NULL, -width, 0, 0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
// Move the window to the new monitor and resize it to fit the monitor
SetWindowPos(hwnd, NULL, monitorRect.left, monitorRect.top, width, height, SWP_FRAMECHANGED);
// Add the WS_POPUP style back to enter fullscreen mode
SetWindowLong(hwnd, GWL_STYLE, style);
// Move the window to the new monitor to fix the visual artifact
SetWindowPos(hwnd, NULL, monitorRect.left, monitorRect.top, 0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
// Create a window that spans the entire work area of the original monitor
//This part fixes another weird visual artifact on the target monitor
MONITORINFOEX mi;
mi.cbSize = sizeof(MONITORINFOEX);
GetMonitorInfo(fromMonitor, &mi);
RECT rect = mi.rcWork;
HWND extrahwnd = CreateWindowEx(0, L"STATIC", NULL, WS_VISIBLE | WS_POPUP, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, NULL, NULL);
// Force a screen refresh on the original monitor
UpdateWindow(extrahwnd);
// Destroy the window
DestroyWindow(extrahwnd);
// Restore the window and move it to the new monitor to fix the visual artifact
ShowWindow(hwnd, SW_RESTORE);
SetWindowPos(hwnd, NULL, monitorRect.left, monitorRect.top, 0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
// Give the window focus
SetForegroundWindow(hwnd);
// Invalidate the window to force a redraw on the original monitor
RedrawWindow(hwnd, NULL, NULL, RDW_INVALIDATE | RDW_ALLCHILDREN);
}
}
EDIT: Everything works perfectly fine if I minimize and then maximize the application before running the code.