I have no idea.
The on-sale filter shows currently about 400 games on sale.
The on-sale filter shows almost 4000 assets on sale.
Maybe it is just not working ok for so large numbers of temporary attributes. And if we look at the total number of games and assets, a suspicous large number of assets are on sale, while a suspicous small number of games are. If we go by the number the on-sale filter gives.