https://thenextweb.com/gaming/2018/10/31/fallout-76-bug-deleted-the-entire-beta-bethesda-extends-it-in-penance/

So Fallout 76 is not exactly off to a great start. A beta test bug has cost several users precious time with the game, apparently fulfilling Bethesda’s promise of “spectacular issues.” 

To begin with, an odd bug with the Bethesda launcher summarily deleted the entire, 47 GB beta after it’d already been downloaded. Bethesda’s support asked users via a now-deleted tweet to stop clicking any buttons on the launcher, as that was allegedly the source of the problem (the game is one of new wave of releases forgoing Steam). Apparently users who had made the mistake of clicking had no other recourse than to try again. That’s not a small download, meaning it’d potentially cost users several hours of game time.