WC3 - Can't open save after patch update

Hi Team,

After the latest Reforged patch update I can not open my latest save file in the campaign. This would not be a big issue if it was not for the fact that I am playing the Rexxar campaign. I have spent maybe 4-5 hours of playing time to build my charachters. I refuse to start over again after spending those hours building my charachters. I do not even dare start from the beginning out of fear that this will happen again when a new patch comes. Could you please fix this so I can continue where I last saved?

Thank you in advance.