Crafting speed for Assembling machines sharing beacons

[Metaing]

If I have:
An "Assembling Machine 3" with 4x"Productivity Module 3" + 4x "Beacons" each with 2x "Speed module 3".
And producing:
"Automation science pack"

The assembly description states:
Crafting speed: 3 (+140%)
Productivity: +40%

And I meassure it produces 50 packs per minute. And it matches the expectations from calculations.

If I now add an extra "Assembling Machine 3" with 4x"Productivity Module 3" sharing the same 4 "Beacons", I still see the same crafting speed and productivity in the description, but it only produces 40 packs per minute (20% less).

[Rseding91]

Can you please provide a save file showing the issue?

[Metaing]

Attached Save file.

[Loewchen]

Both produce identically.

[Metaing]

The 2 assembly machines produce identical. But if you remove one of them the remaining will produce more packs per minute. 40 vs 50.

[Loewchen]

No, they produce 50 no matter what.

[Rseding91]

From what I can tell, the machines aren't running at full speed because they need more energy. By removing 1, it reduces the energy demands enough for the other to run faster.

Now... the million dollar question: why doesn't it show low-power in any of the tooltips or GUI. I have no idea.

[Metaing]

Have tested the same scenario in a full game with 4GW surplus of energy with same difference.

[Rseding91]

Actually, testing more, both running produce 100/minute, 1 running produces 50/minute.

I'm not seeing any difference in speed.

[Rseding91]

Can you record a video showing the difference?

[Metaing]

Weird, I cant reproduce it any more, after having seen it for two days.