When giving /build blocks to other players, some of the blocks (wool, for example) don’t drop out of my inventory. Blocks like glowstone and terracotta have no issues being dropped from inventory or sold via /auction, but wool does not drop and cannot be sold. This makes it difficult to give players certain blocks.
I’m not sure if this is intended or not, but judging by the fact that other /build blocks can be dropped I’m assuming it is not intended.