I suspect that this fact was overlooked or forgotten at this point in the manual, during the revision from version 4 to 5. But my statement is true, I discovered it earlier this year just by accident, then first I tested it with some bundles, and have used it many times since, and so confirmed.
You are not the first user to mention the manual in this context, at least @CrazyCatBird has done so too.
You can read through @tiar’s posting on this from the same topic, where she names this behavior as a new feature of the revised resource management.
Michelist