I watched that steam and i remember you asking that. Such a small world. I remember because my map also has never been on discover.
My map was one of the first that actually worked on day 2 having played the majority in discovery and it never got on discovery instead discovery was filled with games that made no sense and never worked. ie spawning outside the map or 1v1 that has 20 people in it with no building materials.
My map code is
9564-4210-8007
I didn’t feel like making a point of asking but since ive read your comment i thought id also mention mine incase its a Lego issue.