Today I had such problema.U I temporarily lost internet and I flew with servera.Spustya a while I returned and saw that I had zeroed quests (Agrarian Skies server 1) H, C. I do not know much English and may not be sent to this email and if so then perepravte where it is necessary, if not difficult)
I had to reset the questbook, as it was corrupted. Tried 3 different backups but after ~12 hours it was broken again.
