forEachFeatureAtPixel not limiting features?

Question

I'm trying to limit the features returned when I click on the map to just those in the endPoint layer:

    endPoint = new ol.layer.Vector({
            source: new ol.source.Vector({
                features: endPoints //add an array of features
            }),
        });
    map.addLayer(endPoint)

Unfortunately, before this layer is even initialised, whilst clicking on features in other layers they are getting logged to the console. I feel like I'm using the correct syntax to limit the features to just those in the endPoint layer (forEachFeatureAtPixel(pixel, callback, opt_this, opt_layerFilter, opt_this2)) but I must be doing something wrong - if I try to return layer rather than feature it gives me a null value?

Is the issue that I need to name the layer somehow?

    map.on('click', function(evt) {
      var pixel = map.getEventPixel(evt.originalEvent);
      var mapFeature = map.forEachFeatureAtPixel(pixel, function(feature, layer) {
          return feature;
            }, null, function(layer) {
                     return layer === endPoint;
            });
      console.log(mapFeature)
      })

Answer 1

I do my info function this way.

wmsLayer09 is the layer where I want the click search for features, so I only get features from that layer

var feature = map.forEachFeatureAtPixel(evt.pixel,
       function (feature, wmsLyr09) {
          return feature;
       });