hmmm nope… I leveled yesterday after update to 21… got 100 gold, 45 aditional castle space (very little btw) and 200 chest points. Did not see any Moonstone there
Tho, I hightly recommend adding it as loot to chests… you see, If the Moonstone drops with (hopefully) desired items also in the chest, the player may want both or if not all 3 items of a chest, which means, ads, which means ravenue for you guys too. In my opinion is a win-win situation.
You can just add 2-3 and I would be fine with it