check if a group is open or closed

I have a small problem
I need to know if a group is open or closed
I put up a small script in uxp
but it tells me that the group is always open even if it is closed,
this is the script.

checkLayerGroupStatus()

async function checkLayerGroupStatus() {
    const layers = app.activeDocument.layers;
    const groupName = "Color"; 

    const layerGroup = layers.find(layer => layer.name === groupName && layer.layers);
    if (!layerGroup) {
        showAlert( `Level group "${groupName}" not found`);
        return;
    }

    const isOpen = layerGroup.visible;
    if (isOpen) {
        showAlert(`The level group "${groupName}" is open.`);
    } else {
        showAlert( `Level group "${groupName}" is closed.`);
    }
}