Factorio Forums

I made a following simple setup with few labs and 50 red packs in the chests: Then I ran a research that costs 40 red packs. After it finished I collected all remaining packs from labs and chests.
One would expect to get exactly 10 remaining packs (50 - 40 = 10), but there are 11 (10 full + 1 ghost with 0%): I think it's related to a known issue of "lossy science", but still looks fun. There are 2 essential conditions: one of the inserters should be slower than others; and number of packs should be more than required for a particular research.

Steps to reproduce:
1. Load the save: 2. Connect labs to power grid (research and packs are already set).
3. Wait for research to finish.
4. Collect all remaining packs.
5. Profit!

The pack isn't actually at 0%. It's < 1% and when converted to a % to be shown it ends up showing 0.

It's a side effect of packs being consumed over-time and not something we consider worth putting time into since it works fine you just get little quirks like this.