The Alchemist has 2 recipes to convert materials to Obducite. One uses Ingolith, the other uses Neathiron. Ingolith is no longer used in D4, but you might see that it is still available for you to convert to Obducite.
Don’t do it. It actually uses your Neathiron. I lost a lot of it to this stupid bug.
The other recipe, the one that is supposed to convert your Neathiron to Obducite, doesn’t even work, so that is bugged as well, but at least it doesn’t cost you anything.
Yet more evidence of the excellent quality control at Blizzard.