MultiAtlasFiles would incorrectly add the atlas JSON into the JSON cache, causing you to not be able to destroy and reload the texture using the same atlas key as before. Fix #4720

src/loader/filetypes/MultiAtlasFile.js

@@ -148,8 +148,6 @@ var MultiAtlasFile = new Class({
         {
             var fileJSON = this.files[0];
 
-            fileJSON.addToCache();
-
             var data = [];
             var images = [];
             var normalMaps = [];