Can't load prefab on native release mode

I load some prefab dynamically, In Web, both debug mode and release mode are ok, In native (win32 + android), it only success in debug mode, in release mode, all prefab can’t load, I use cc.loader.loadRes and place all prefab in resources folder, below is my code and setting to build

cc.loader.loadRes("prefab/demo", cc.Prefab, (err, prefab) => {
     if (err)
          console.log("load asset error ");
     else
           console.log(prefab); // prefab is undefined in native release mode
 });