A critical issue has been found where important items can be sold.
Some items are necessary for game progression and selling them will make further progress impossible.
We sincerely apologize for the inconvenience. Please be careful not to sell these items.
This issue has been fixed in the latest version, making these items unsellable.
Known Bugs and Fixes Announcement
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.