K/DA Skins and other items in the store

I have a question about K / DA skins, which is why they cannot be bought freely in the store. I understand that they were on sale 1 year ago, but failed to understand why they can no longer be bought, because supposedly in the PBE everything should be for purchase in case of any failure within the game and which can be report, after all we are on the test server. And not only with those skins, also with different icons and other skins that are for sale on the official server, if they could answer these questions it would be very helpful.
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