So the page for the Solstice event said that every item in Eververse that was added for Solstice of Heroes would be sold for Silver [b][u]AND[/u][/b] Bright Dust. Even with Solstice of Heroes being extended by a week some items never went up for sale for bright dust. The Sunglasses [u]projection[/u], Palm Tree [u]projection[/u], Crab [u]projection[/u], and Beach Ball [u]projection[/u], which were added with Solstice of Heroes, were never available to purchase for bright dust. So oversight or lie Bungie? Your move on the answer and possible fix.
DMG has already answered/addressed this exact question. https://www.bungie.net/en/Forum/Post/253275615/0/0