How old is the open beta?

[olwatshisface]

I'm playing the open beta right now and it seems really unpolished.
A few bugs I've encountered in about 1 hour of playtime in the Beta:

• Subtitles stuck on the screen
  
• Camera clips through the floor when I get knocked down and freaks out.
  
• Started a trial and the next wave would not spawn, trapping me in a room until I quit to menu
  
• Fought the Arbiter of Flesh and his AI broke, so he stood in place until I knocked off about 20% of his health
  I'm hesitant to get the full game if it's similar in jank to the demo.