diff --git a/src/loaders/AudioLoader.js b/src/loaders/AudioLoader.js
index 2544e2297ef575..b884756b1aa26b 100644
--- a/src/loaders/AudioLoader.js
+++ b/src/loaders/AudioLoader.js
@@ -60,11 +60,21 @@ class AudioLoader extends Loader {
 				const bufferCopy = buffer.slice( 0 );
 
 				const context = AudioContext.getContext();
+
+				const decodeUrl = url + '#decode';
+				scope.manager.itemStart( decodeUrl ); // prevent loading manager from completing too early, see #33378
+
 				context.decodeAudioData( bufferCopy, function ( audioBuffer ) {
 
 					onLoad( audioBuffer );
+					scope.manager.itemEnd( decodeUrl );
+
+				} ).catch( function ( e ) {
+
+					handleError( e );
+					scope.manager.itemEnd( decodeUrl );
 
-				} ).catch( handleError );
+				} );
 
 			} catch ( e ) {
 
diff --git a/src/loaders/ImageBitmapLoader.js b/src/loaders/ImageBitmapLoader.js
index 6d3a2abeadb022..369118b53c2ce0 100644
--- a/src/loaders/ImageBitmapLoader.js
+++ b/src/loaders/ImageBitmapLoader.js
@@ -86,6 +86,9 @@ class ImageBitmapLoader extends Loader {
 	 * Sets the given loader options. The structure of the object must match the `options` parameter of
 	 * [createImageBitmap](https://developer.mozilla.org/en-US/docs/Web/API/Window/createImageBitmap).
 	 *
+	 * Note: When caching is enabled, the cache key is based on the URL only. Loading the same URL with
+	 * different options will return the cached result of the first request.
+	 *
 	 * @param {Object} options - The loader options to set.
 	 * @return {ImageBitmapLoader} A reference to this image bitmap loader.
 	 */