OS and version: 6.17.8-arch1-1
Release or commit: GLFW 3.4
Error messages: no error messages

Using Wayland on Arch Linux with GNOME 49.2, 200% system scaling sets window->wl.fractionalScale to true even though it is not a fractional scale:

src/wl_window.c lines 403-404

void _glfwUpdateBufferScaleFromOutputsWayland(_GLFWwindow* window)
{
...
    if (window->wl.fractionalScale)
        return;
...
}

This causes _glfwUpdateBufferScaleFromOutputsWayland to exit early. As a result, window->wl.bufferScale is never updated to 2 and stays at 1. In the setCursorImage function, this then causes the cursor to not be set to cursorWayland->cursorHiDPI and its scale to not be updated to 2. In the wl_surface_set_buffer_scale call, the compositor is then fed a 24x24px cursor image instead of a 48x48px image, which it then scales by 2, resulting in a blurry cursor when running the examples:

src/wl_window.c lines 1092-1096, 1117

static void setCursorImage(_GLFWwindow* window,
                           _GLFWcursorWayland* cursorWayland)
{
...
        if (window->wl.bufferScale > 1 && cursorWayland->cursorHiDPI)
        {
            wlCursor = cursorWayland->cursorHiDPI;
            scale = 2;
        }
...
    wl_surface_set_buffer_scale(surface, scale);
...
}

Commenting lines 403-404 in src/wl_window.c fixes the blurriness problem but causes the mouse to be half as small. I will open another issue for this, as I have found the cause.