I imported my HDA into UE5.4.4 and got the heightmap, but it seems like there is no layer information?

To check whether the data was imported correctly, I applied a simple material to my landscape, but the result looks like the screenshot I attached, and I don’t understand why this is happening.

When exporting from Houdini 20.5.278, I can clearly see that the snow_layer, land_layer, and other layers are present. I would like to know how to solve this issue.