Try to verify cache. Open Steam, go on your library. Right click on the game and go into "Properties". Then click on "Local Files" tab and hit the "Verify game cache" button.
At the end it generally downloads a 13.7-14MB patch that generally fixes the issue. I don't know if it will fix it also with the beta tho
Considering we are talking of digital copies imo it would have been fair to put it to a price similar to 40$, pretty much like what CDProject Red did with the Witcher 3.