Texture Array Mipmap wrong

When I create texture array for my textures, it shows nothing until I adjust LOD bias to 2.
My texture size is 256×256, when I use 2K texture it seem like only work at mipmap level of 5.
I try to cancel texture stream and turn sRGB on but it doesn’t work.
How can I get the correct mip map?

By the way my engine version is 5.02, but I get the right mipmap in UE 4.27… :thinking: :thinking: