Somewhat of a "bug" I found when messing with my market inventory.

You can put up items for sale, but then you can put those items into a set while they are in market, which leaves them on the market, but if you try to buy them from the market it says "item is part of a set. You have to buy whole set" or something similar.

Just letting devs know, since anyone could put up a bunch of items for 1 TC and make them unavailable for buying.