Win11 taskbar background is black in Classic theme in version 197, as expected in 191

[Anixx]

Describe the bug

This is under version 191:

Under version 197:

Area of issue

Taskbar

To reproduce

1. Use these settings with the Taskbar Styler Windhawk mod:

{"theme":"","controlStyles[0].target":"TextBlock#LabelControl","controlStyles[0].styles[0]":"FontFamily=Tahoma","controlStyles[1].target":"Taskbar.TaskListButton","controlStyles[1].styles[0]":"CornerRadius=0","controlStyles[2].target":"Rectangle#BackgroundFill","controlStyles[2].styles[0]":"Fill=Transparent","controlStyles[3].target":"Taskbar.TaskListButton#TaskListButton","controlStyles[3].styles[0]":"VerticalAlignment=3","controlStyles[4].target":"Taskbar.TaskListLabeledButtonPanel@RunningIndicatorStates > Rectangle#RunningIndicator","controlStyles[4].styles[0]":"Height=2","controlStyles[5].target":"Microsoft.UI.Xaml.Controls.AnimatedVisualPlayer#Icon","controlStyles[5].styles[0]":"IsVisible=0","controlStyles[3].styles[1]":"","resourceVariables[0].variableKey":"","resourceVariables[0].value":""}

The key value here is
"controlStyles[2].target":"Rectangle#BackgroundFill","controlStyles[2].styles[0]":"Fill=Transparent"

2. And use this mod to refresh the taskbar:

// ==WindhawkMod==
// @id              win1-taskbar-classic-theme-helper
// @name            Win11 Taskbar Classic helper
// @version         1.0.0
// @author          Anixx
// @include         explorer.exe
// ==/WindhawkMod==

void ApplyTaskbarMod() {
    HWND hTaskbar = FindWindow(L"Shell_TrayWnd", NULL);
    if (!hTaskbar) return;

    SetWindowLong(hTaskbar, GWL_STYLE, GetWindowLong(hTaskbar, GWL_STYLE) & ~0x840000);

    HWND h = FindWindowEx(hTaskbar, NULL, L"ReBarWindow32", NULL);
    if (h) ShowWindow(h, SW_HIDE);

    h = FindWindowEx(hTaskbar, NULL,
        L"Windows.UI.Composition.DesktopWindowContentBridge", NULL);
    if (h) {
        ShowWindow(h, SW_HIDE);
        ShowWindow(h, SW_SHOW);
    }

    h = FindWindowEx(hTaskbar, NULL, L"TrayNotifyWnd", NULL);
    if (h) ShowWindow(h, SW_SHOW);
}

DWORD WINAPI WorkerThread(LPVOID) {
    for (int i = 0; i < 10; i++) {
        Sleep(1000);
        ApplyTaskbarMod();
    }
    return 0;
}

BOOL Wh_ModInit() {
    ApplyTaskbarMod();
    HANDLE h = CreateThread(NULL, 0, WorkerThread, NULL, 0, NULL);
    if (h) CloseHandle(h);
    return TRUE;
}

void Wh_ModUninit() {
}

Expected behavior

Th taskbar is of the ButtonFace color

Open-Shell version

4.4.197

Windows version

Windows 11 23H2

Additional context

No response