Continue passing null instead of unmanaged layer to forEachFeatureAtCoordinate

src/ol/map.js

@@ -604,8 +604,9 @@ ol.Map.prototype.disposeInternal = function() {
  *     called with two arguments. The first argument is one
  *     {@link ol.Feature feature} or
  *     {@link ol.render.Feature render feature} at the pixel, the second is
- *     the {@link ol.layer.Layer layer} of the feature. To stop detection,
- *     callback functions can return a truthy value.
+ *     the {@link ol.layer.Layer layer} of the feature and will be null for
+ *     unmanaged layers. To stop detection, callback functions can return a
+ *     truthy value.
  * @param {S=} opt_this Value to use as `this` when executing `callback`.
  * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
  *     filter function. The filter function will receive one argument, the

src/ol/renderer/maprenderer.js

@@ -139,9 +139,9 @@ ol.renderer.Map.prototype.forEachFeatureAtCoordinate = function(coordinate, fram
   function forEachFeatureAtCoordinate(feature, layer) {
     goog.asserts.assert(feature !== undefined, 'received a feature');
     var key = goog.getUid(feature).toString();
-    if (!(key in frameState.skippedFeatureUids &&
-        !frameState.layerStates[goog.getUid(layer)].managed)) {
-      return callback.call(thisArg, feature, layer);
+    var managed = frameState.layerStates[goog.getUid(layer)].managed;
+    if (!(key in frameState.skippedFeatureUids && !managed)) {
+      return callback.call(thisArg, feature, managed ? layer : null);
     }
   }