Clone spreadsheet loose drawings

[PasCapableTrouverUnNom]

I know this was an issue that has been solved from previous versions (Used to work on 1.14 but not anymore in 1.21)

Summary: Cloning a worksheet loose drawing (in 1.14 we used to lost only parameters)

   //open the final spreadsheet
    $spreadsheetFinale=new Spreadsheet();
    $NomFichierFinal = storage_path('app/Output/Rapport_' . $userId . '.xlsx');
   //I open multiple spreadsheets ($exportSelected is that list) and add their sheet to the new file
    foreach ($exportSelected as $selected) {
        $NomFichier = storage_path('app/Output/FicheBrute_' . $userId . '_' . $selected['reporttype'] . '_' . $selected['ObjID'] . '.xlsx');
        //Open the Model
        $reader = new reader\Xlsx();
        $spreadsheet = $reader->load($NomFichier);
        $sheetNames = $spreadsheet->getSheetNames();
       //For each sheet of the  $NomFichier I clone the sheet in the new file $SpreadsheetFinale
        foreach ($sheetNames as $sheet) {
           //Select the sheet
            $OutputSheet = $sheet . '_' . $selected['reporttype'] . '_' . $selected['ObjID'];
           //clone the sheet
            $cloneWorksheet = clone $spreadsheet->getSheetByName($sheet);
           //add the sheet to the new file
            $spreadsheetFinale->addExternalSheet($cloneWorksheet);
            //Change the name of the worksheet in the new spreadsheet
            $sheet = $spreadsheetFinale->setActiveSheetIndexByName($sheet);
            $sheet->setTitle($OutputSheet);
        }
    }
   //Once all worksheets has been added we delete the worksheet named 'Worksheet' which is default when we create a spreadsheet
    $spreadsheetFinale->setActiveSheetIndexByName('Worksheet');
    $sheetIndex = $spreadsheetFinale->getActiveSheetIndex();
    $spreadsheetFinale->removeSheetByIndex($sheetIndex);
      //Create a new writer to write the new spreadsheet
    $writerFinal = new writer\Xlsx($spreadsheetFinale);
    $writerFinal->save($NomFichierFinal);

    return response()->download($NomFichierFinal);

Note:

• I tried setIncludeChart(True);, the result is a corrupt file
• This exact code (I removed the input for sake of simplicity) works just fine in 1.14
• The spreadsheet selected have been created by PhpSpreadsheet in a previous step (the user see them all, select and then we compose a compilaiton with the selected spreadsheet). The output of this first step (the excel files) are PERFECT when I look at them individually.

Any hint or path would be appreciated... I saw some similar problem in very old post but nothing recent and the solutions do not seems to work.

Thanks