Open Dev testing is very frustrating. A few days ago game hung at turn 117, so started a new game two days ago.   I played Humankind last night fine got to turn 107. Today I load game and tell it to load my save file.  Acts like it is loading but takes me back to load screen. Try an older file, same thing. Try to start a new game, no good, keeps returning to start/load screen. Uninstalled and reinstalled, same thing.  Wondered if something happened to my computer but I am able to play AoE 3, Civ6, and Endless Legend.   It is like the timer set for Monday has gone off today.

updated my Nvida drivers to 466.27 no difference.

I have the same problem trying to reload a prior save.  Closing and rebooting the computer fixed my issue.