UPDATE 6TH MARCH 2021: People Can Fly has stepped in again to change the Outriders demo in response to complaints over a previous change designed to tackle heavy farming.
The developer issued a server-side update to enable the Gauss boss chest to drop legendaries after yesterday preventing all chests from dropping legendary items.
"Having listened to very reasonable community feedback, we have enabled the Gauss boss chest to drop legendaries again as we should indeed be rewarding boss runs," People Can Fly said in a tweet.