This had been an issue for the passed few months probably but I never brought it up.
Basically, I buy the released icons that come out in the PBE patches but it doesn't appear in my icon pool when I try to change.
The most recent ones I have are the Star Guardian ones but others are missing as well that were released before it.
Even though it doesn't show in my purchase history for me, I do remember purchasing the icons.
And for some reason I still have some of the 2016 Worlds icons in my shop but it has a placeholder icon and an error occurs when I try to purchase it.