[0.13.6] Automation 2 takes more packs than it displays

[Brunius]

Automation 2 displays that it requires 40 Science Pack 1, but uses 80 to complete. I haven't seen this before, and haven't turned anything up in my search of the forum, so I'm pretty sure it's 'newish'.

Attached is a save where this can be replicated. After the insertion of 40 science packs, the completion bar will be half-full.

I first encountered this in my single-player game, but the attached save is in sandbox, as I wasn't sure if it was a save problem.

This doesn't appear to affect any other technology (at least any that I've checked)

I think this is unlikely to be related to my setup in particular, but it's detailed below just in case.

Factorio Version: 0.13.6
Operating System: Windows 10 Pro 64-bit (10.0, Build 10586)
Language: English
Processor: i5-3330 (4 cores @ 3.0GHz)
RAM: 8192MB
Graphics: Geforce GTX 760, 2GB
Graphics Driver version: 10.18.13.6822

[DaveMcW]

It requires 40 sets of 2x Science Pack 1.

I agree this is incredibly confusing, there is no reason to require sets of anything other than 1.

[TruePikachu]

Not a bug. Automation 2 requires 40 instances of 15 seconds + 2 Science Pack 1. Notice there is a number "2" on the vial, indicating you need two of them each cycle.

[bk5115545]

While it's not a bug, I see very little reason to not require 80 instances over 7.5s instead of 40x2 instances over 15s.

It's fairly confusing.