// removing the sheet makes it good again
wb.removeSheetAt(wb.getSheetIndex(sheet));
writeTemp53691(wb, "cgood");
// cloning again and removing the conditional formatting makes it good again
sheet = wb.cloneSheet(0);
removeConditionalFormatting(sheet);
writeTemp53691(wb, "dgood");
// cloning the conditional formatting manually makes it bad again
cf = sheet.getSheetConditionalFormatting();