I'm having this problem too and have for the last month (July 2020). However, if you go in to the Developer side, then connect through it to App Store Connect it does update and move the date along. Strange.
Symanski
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Found another method to do the building, creation and comparison of the hash that seems to work. Although it's strange that the original code works ok on the iOS devices but not on the Mac. I'm not a good enough programmer to delve deep in to why.The other code needs modification as it doesn't work fully on the Mac, so I've got a hybrid between the two now. Bit messy, but working.