Inserter "Waiting for source items" from full belt?

[austere quail]

Just started playing this game again since 2.0 came out, and I'm seeing what looks like a bug with very basic inserter logic when a machine's output is full. Sometimes the inserters feeding my furnaces won't keep the furnace's internal input buffer full when the furnace's output is full. The inserter's error message is "Waiting for source items", even though it's source belt is completely full. The furnace's error message is of course "No ingredients". The problem fixes itself as soon as the output inserter takes an item from the furnace, bringing the output buffer back down to 99, at which point the input inserter starts immediately filling up the furnace again. So not a game-breaking bug by any means, but it results in less than 100% efficiency, which prevents me from sleeping soundly at night.

I also tried replacing the burner inserter with an electric inserter, but it didn't has the same problem.

[hoary tiger]

What if you manually remove the stack of plates. Did it fill that much solely through inserters or did you manually toss ore into it

[tawny harbor]

I can reproduce this, but I'm pretty sure that's pretty much the same behavior as it had in 1.1?

I think it can only happen "naturally" if you're very short on input or using burner inserters. Otherwise the inserter will fill the input buffer before the furnace's last craft finishes.

[austere quail]

I feel like it's happening fairly often in my factory. I didn't notice it in 1.1, and I feel like I would have noticed it since I always play with Bottleneck indicators on.

[steel apex]

So not a game-breaking bug by any means, but it results in less than 100% efficiency
I don't think this is a bug at all, and you're not losing any efficiency either.

What efficiency are you losing when a system that's backed up stops producing?

It's backed up anyway

I'm mostly confused by the fact that your furnaces don't seem to have an output

[austere quail]

There’s a small delay when the inputting inserter finally starts up again until it fills the input, buffer with enough materials to start producing the recipe

[steel apex]

so?

the delay is irrevelevant, because the output is backed up

the delay would be relevant if it was larger than the time it would take the output inserter to grab all 100 plates

but it's not

[austere quail]

That’s true. Just odd seeing a period of time when the machine is complaining about lack of input items even though it has plenty waiting to be picked up on the belt.