Yes, it was happened every time you had nothing in a build queue after builded item, when game just open a planetary window to you to ask about next building to be set. Every time it happend you get a full trade-goods bonus from the previous turn production, in addition to builded item and stored production. If you never let game do so and always kept queue full - then it never happend.
Point is what most people cheated this way without any intention, and surely it can be also exploited on max, but its other story.