I noticed the same thing when mining scrap with big mining drills, also with 50% productivity research.
Was trying to fill the express belt (45/s) with 6 miners, 3 on each side (7.5 /s each), and it didn't work - every time productivity bonus generated an extra item it always coinsided with a normal ...

Discovered it while reading Satisfactory forums, people often mentioned Factorio there, which got me interested.

My first impression - I was amazed by the music, quality of sounds and overall sound design. Didn't expect them to be that good.

Then, the tutorial missions seemed too overwhelming to me, I reached the one with trains, closed it and went to play the game instead.