Prior to this update, no matter what difficulty you chose, it would put you on normal. Now it will actually put you on the other difficulties. Live for Windows, will be live for MacOS in a few hours.
MAJOR BUG FIX: Difficulty selection actually working!
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.