What you encountered is the well known MD5 Error. You can not recover what you lost as both the XBox cloud save and your local save are both synced now that you've restarted the game. TFP doesn't store any of the information themselves, so unless you have a hard copy of the save on an SSD or external drive you won't be able to restore the game.
You can learn more about it in the pinned thread here and at Reddit... https://www.reddit.com/r/7DaysToDieXbox/s/RWe4ZNL2Lx