Why can't the second floor of the abyss of the original god play?

There are no two stars on the first floor. Genshin Impact is an open-world adventure game produced and distributed by Shanghai Mihayou Network Technology Co., Ltd. According to the rules of spiral abyss, the star of the upper layer needs to reach two stars to open the next layer, but the reason why the second layer of spiral abyss can't be played is that the first layer doesn't reach two stars, the spiral abyss has 12 layers, and the first eight layers are high reward levels.