The public beta branch "nuhw_live_prereleasebeta" contains a new system helping players who face a corrupted save to restore it.
This system is trying to gather different data to rebuild a functional save.
In certain cases, it is possible that a part of the current save is too much corrupt to allow a restoration, and the save will be partially or completely lost.
For more information about the public beta branch and this system, please see: https://steamcommunity.com/app/566440/discussions/0/2838914020262484168/