Azure/Emerald Weapon Effect MTXs don't work on The Supreme Truth crystal sceptre

I first noticed this on my rare Karui Sceptre that was reskinned with a Supreme Truth. Unsure if it was just an issue with the reskin, I then tested it on a plain Supreme Truth and the weapon effects still don't appear.

For comparison, here's my Karui Sceptre with Supreme Truth skin and no weapon effect MTX: http://i.imgur.com/NrrJcXV.jpg

The same Karui Sceptre with Supreme Truth skin AND Azure Weapon Effect MTX: http://i.imgur.com/3Sj5WtD.jpg

regular Supreme Truth sceptre with Azure Weapon Effect MTX: http://i.imgur.com/dl4licE.jpg

Doesn't work. I then tested it with the Emerald Weapon Effect MTX and the result is the same.

I don't have any other weapon effect MTXs to test (I only own the Emerald and Azure effects).

System specs:

Windows 7 Professional 64-bit
AMD Phenom II 965 Processor with 8 GB ram
AMD Radeon HD 5850 graphics card
DirectX 11

Thanks

bump. Can I get some confirmation that the devs are aware of this bug?