fix ImageLoader manager issue (#9176)

src/loaders/ImageLoader.js

@@ -12,12 +12,16 @@ Object.assign( THREE.ImageLoader.prototype, {
 
 	load: function ( url, onLoad, onProgress, onError ) {
 
+		var scope = this;
+
 		var image = document.createElementNS( 'http://www.w3.org/1999/xhtml', 'img' );
 		image.onload = function () {
 
 			URL.revokeObjectURL( image.src );
 			if ( onLoad ) onLoad( image );
 
+			scope.manager.itemEnd( url );
+
 		};
 
 		if ( url.indexOf( 'data:' ) === 0 ) {
@@ -26,7 +30,7 @@ Object.assign( THREE.ImageLoader.prototype, {
 
 		} else {
 
-			var loader = new THREE.XHRLoader( this.manager );
+			var loader = new THREE.XHRLoader();
 			loader.setPath( this.path );
 			loader.setResponseType( 'blob' );
 			loader.load( url, function ( blob ) {
@@ -36,6 +40,7 @@ Object.assign( THREE.ImageLoader.prototype, {
 			}, onProgress, onError );
 
 		}
+		scope.manager.itemStart( url );
 
 		return image;