Cursecarver unique wand ability 'Decompose' uncastable

Just picked it up as it goes well with the lich witch build and modified some skills to use corpse explosion to support decompose to finish contagion/ed dots.

Unclear if others have reproduced, I have not been able to find other reported instances.

Cursecarver Acrid Wand with +4 enfeeble. Assign Decompose skill, attempt to cast - no animation or skill response.
I would not expect any other dependencies/requirements as the wand is equipped thus the skill should be castable.

P.S.
It'd be nice if the contagion spread from corpse explode applied to the corpse explode spread from Decompose/poison clouds.

Working now - not sure what changed.

So it does seem to be very inconsistent.
Since previous 'working' reply - decompose skill worked for 4 different areas, including decomposing Ektab boss in Act 2 cruel. Immediate next area Keth, decompose no longer works.