Using the Robes of Xin-Shalast when on someone else's turn to discard an item and search for an item from deck will leave the item in the active character's hand.  I noticed this when using Ezren's robes to get an amulet of inescapable location during Sajan's turn.  In case it's important, Sajan's turn follows right after Ezren's.

Thanks for reporting this.