Hi! when I build the project on Android (Galaxy S6 Anroid-> ASTC & Android-> ETC2) and choose the size (scale) skybox (10000x10000x10000)textures appear in the defect:
You are running into precision issues where the depth buffer can’t handle the immense values from scaling the skybox by 10000. This can be especially true for mobile.
Basically you are running into a hardware limitation and need to find a clever workaround that still has the same visual effect. For example if this is a single player game you can attach the skybox to the player so they move together making it seem just as big. That way the player will never reach the end either.
That is merely a suggestion though, there are many ways to come up with creative solutions.