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Note: This does not affect vanilla gameplay, since no vanilla assembling machine is both a furnace (automatic recipe selection) and uses fluids.

Whenever a furnace type assembler has a fluid for the output and backs up, the inserter feeding the item part of the recipe goes asleep as normal. However, when the assembler is ready to go again, the inserter never wakes up and the assembler sits there with no items. Spinning the inserter 4 times (putting it back to the original orientation), removing and replacing the inserter, or manually inserting a single item is enough to restart production and the inserter works again (until it backs up).

Tested with the following mods:
- Creative Mode
- Custom mod that has a furnace type assembler involving fluids

I've attached a save and my mod, which demonstrates the issue.

Here's an image showing where the issue lies:



The assemblers marked in red are not being fed because the inserters marked in purple are idle. Messing with those inserters will temporarily fix the issue, but setting game speed to 100 and waiting results in the problem resurfacing. This happens every time without fail, and always when the output backs up.

Does this issue persist in 0.15?

Issue still exists on 0.15.35.

Thanks for the report. This is fixed for 0.16.

Issue persists in 0.16.2. https://mods.factorio.com/mods/Hexicube ... Processing

Steps to reproduce:
- Place a liquidator and provide crushed ore via an inserter as well as sulfuric acid, but do not extract the output.
- Note: A separate issue surfaces if you place the inserter first; The inserter does not activate once acid is provided.
- Once full, extract output.
- Inserter does not resume adding items.
- Rotate the inserter in-place, and now it works.

Hexicube wrote:Issue persists in 0.16.2. https://mods.factorio.com/mods/Hexicube ... Processing

Steps to reproduce:
- Place a liquidator and provide crushed ore via an inserter as well as sulfuric acid, but do not extract the output.
- Note: A separate issue surfaces if you place the inserter first; The inserter does not activate once acid is provided.
- Once full, extract output.
- Inserter does not resume adding items.
- Rotate the inserter in-place, and now it works.

Can you provide an updated mod and sample save file that shows the issue?

Sorry for the large delay, forgot about the issue.

Relevant mod: https://mods.factorio.com/mods/Hexicube ... Processing (tested with v0.5.1 in 0.16.51)

Save is attached.

In the top example, I added the inserter before attaching the acid feed, and it initially operated fine. If it happens to fill the output buffer (200) and deplete the clean ore feed in the same operation, it will stop functioning. I did end up using speed 3s in the first machine in the chain to get this to happen.

In the bottom example, I added the inserter after attaching the acid feed. The machine does not start. This should be far easier to reproduce, as the issue is build-order dependant.

In both examples, if you force the inserter to update (spin it), it resumes functioning until the scenario in the top example presents itself.

I have the same issue with barreling pumps in Angels mods.

Moving this to resolved for 0.17 because 62434 was resolved for 0.17.