Platform: Xbox
Problem: When I finished the main story and placed the last special puzzle piece into place to trigger the ending cutscene, everything went as it should, that is until it ended. I saw the credits, thanked Paul, and then I was back at the menu, seemingly by design. However, upon loading my save, I realized it doesn't save prior or after the cutscene, so I lost the last 4 hours of progress composed of farming a ton of ammonium, digging the entire tunnel from the surface to the core of Glacio, getting the puzzle pieces needed, and finishing the game.
Background: Nothing special or out of the ordinary was happening, I didn't even have any research going or anything else going on. I was simply just trying to enjoy the game.
Note: This is incredibly demotivating. I did get the galaxy skin and palette unlock thankfully, but losing that much progress because I was attempting to play the game as it was designed was and still is deeply upsetting.