Playing the Nullius Mod with the Campat(ability) Mod for using this mod.
I have not noticed this until after I had researched both the Transport Drone Speed 1 and Transport Drone Capacity 1 techs, so I don't know which one is now causing this, But what is happening is that SOME of the Drone fetches are immediate. Some of the drones are acting correctly but several of them pop out (you can see the animation), then disappear and the thing that they were going to go get is now inside the Requestor.
I have not noticed this until now, but I am certain that it wasn't doing this at all BEFORE I had researched both of those techs.
If you need a save to check it out, I have saved this and If you give me the instructions, I can leave a copy on any site you want me to do so.
Let me know...