A texture compressed with PVRTexTool using ASTC compression cannot be correctly imported if the file format is PVR.
The console spams "Assertion failed: Unknown compressed texture format!"
BC3, ETC2 and PVRTC compression formats do not experience this behavior and work fine with the PVR format.

Steps to reproduce:
1. Open user's attached
2. Open scene "Main". Notice: Game Object "ASTC (PVR)" has artifacts
3. Go to Assets/Textures/ASTC. Notice: the texture that causing the issue is "iop_small (pvr)"

Result: The file should be imported correctly (like for BC3 formats for instance) but it's not.

Reproduced with: 2017.2.0a1, 2017.1.0b7, 5.6.1p2.