I have been using some old blueprints and fixing/updating them as I go (for 0.17.x compatibility) and I assigned my assembly machines to make a Passive Provider Chest, and one for a Storage Chest....
Then, I opened up my research, started "Construction robotics" research and noticed that it said under Effects for it, that it unlocks the Passive Provider and Storage chests - however, I am already able to make them, both via my character inventory and assembly machines!
[0.17.3] Passive / Storage chests unlocked before research.
Re: [0.17.3] Passive / Storage chests unlocked before research.
Both Construction and Logistics Robotics unlock them.
Re: [0.17.3] Passive / Storage chests unlocked before research.
tehfreek is correct. The intent, presumably, is to ensure that you don't have access to passive/storage chests until the moment you have something that uses them.