Carousell menu shows no pictures when new assetbundle is loaded

Hello everyone!

I got a carousell menu I bought. It is this one. https://assetstore.unity.com/packages/tools/gui/carousel-menu-144689

I set up assetbundles that are loaded if the user decides so by pressing a button. The carousell menu consists also of buttons. I use sprites to give the buttons another look. If another assetbundle is loaded the sprites should also change. Now I got this weird situation where everything works as inteded when I load an assetbundle for the first time. As soon as I load a second assetbundle the sprites are not displayed on the buttons.

The coding for the sprites

  foreach (var name in requestAssets.allAssets)
                         {
                             cellController.AddCell(); //Add Cell to Menu
                             var f_menuItem = GameObject.Find("Content").transform.GetChild(counter).GetComponent<Image>();  //Getting image of button                
                             Sprite sprite = loadedAssetBundle.LoadAsset<Sprite>("Picture_"+name.name); //Load Picture from AssetBundle
                             f_menuItem.sprite = sprite;
          
                             counter++;
                         }
                         noOfLoadedCells = counter;
                         counter = 0; //Rücksetzen counter

The code to remove the cells as another bundle is loaded

                     for (int i = 0; i < noOfLoadedCells; i++)
                     {
                         cellController.RemoveCell(0);
                         //var cellChild = GameObject.Find("Content").transform.GetChild(i);
                         //Destroy(cellChild);
                         //Debug.Log("Destroyed " + cellChild.name);
                     }

In RemoveCell() I need to use 0 since one cell might remain at the end. If I do not use 0 (but i) one cell remains and with the next call of AddCells() an additional cell is generated.

Funny enough if I load assetbundle1 and then assetbundle 2 ONE of the sprites shows up. If I load assetbundle 2 followed by assetbundle1 or assetbundle2 NO sprites shows. But as said: All show up when the assetbundle is loaded the very first time.

Any idea where to look?