The CTS tests always use random image sizes for testing images, which was not valid for PVRTC1 textures. With 1.3.279 a VUID was added to require power-of-two dimensions for PVRTC1 textures, as discussed in https://github.com/KhronosGroup/Vulkan-Docs/issues/1991.
The CTS tests always use random image sizes for testing images, which was not valid for PVRTC1 textures. With 1.3.279 a VUID was added to require power-of-two dimensions for PVRTC1 textures, as discussed in https://github.com/KhronosGroup/Vulkan-Docs/issues/1991.
Also, this fixes a bug introduced with https://github.com/KhronosGroup/VK-GL-CTS/commit/4c7e4e98f9e577ecd5bf2d922cd756aadc02701a, as it required the extension to be present for the PVRTC formats to be tested, but it was never added as a extension to be enabled, so PVRTC textures were never tested.