The rules (or subsequent rulings?) say specifically that "You must also reveal all face-down spells and permanents you control if you leave the game or the game ends." This should include cards placed face down using Manifest dread. However, I have found on reviewing the battlefield after a game ends (in this case when I lost) the cards are not revealed by the Arena client. See the attached screenshot, taken after the game's conclusion, where the card is not revealed. Hovering over it also does not reveal it (it shows an enlarged "face down card" image, not the card that was manifested).

Please fix. Players should have access to this information.