Unity and multiple ASTC blocks

Hi,

I’m using 4x4 ASTC block compression for normals and masks and 6x6 blocks for diffuse maps. However, by checking textures uploaded to GPU with Mali Graphics debugger all compressed textures were uploaded as 6x6 ASTC blocks as you can see in the screenshot below.

2271426--152242--compressed textures.JPG

Does unity only support one type of block compression with ASTC?

I’m using Unity 4.6.6p2.