Challenge - Vendor Recipes - Magic Boots with Move Speed

In the hideout, using Lilly Roth as the vendor.

Traded a pair of ilvl 70 boots 10% move speed boots with an ilvl 3 or 4 quicksilver + aug to Lilly, got back magic 15% boots & didn't get step completion.

Tried again with the 15% boots, got back 20% boots and still no completion.

Boots were 30% quality.

Presumably either the fact it's Lilly in the hideout or the boot quality is blocking completion of the challenge step.

If it's not a bug, but an intentional "Lilly-in-the-hideout isn't a vendor" issue then you better make that clear in the challenge text in future cos challenge recipes aren't always so cheap.