[2.0.23] Stack inserters will very rarely pick up an extra item

[Generallydonothing]

Stack inserters will very rarely pick up an extra item off a two lane belt and deadlock themselves. I noticed this happening every ~15 or so hours with my rail assemblers for purple science, picking up an extra stone or steel, which is very annoying when constantly researching mining production. I've attached a save file that contains my setup with the creative mode mod. This also seems to more reliably happen when changing the modules in an assembler.

Stack Inserter Testing.zip

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[boskid]

How long should i wait until the issue appears? i reached tick 5'000'000 and everything keeps working.

I did some experiments in 2.0.23 and if one of the stack inserters on the spawn (right) is set to drop items in stacks of 1, then it looks this setup halts relatively quickly, however when trying to do the same steps in 2.0.25 everything is working fine which makes me suspect it may be the same issue as 118138 that was fixed in 2.0.24.

[Generallydonothing]

That was probably the issue Boskid! I linked a stone patch to my rail build directly, so a stack size lower than four could appear if a big drill ran out of stone. I'll check later if removing modules still causes deadlocks. You're welcome to resolve this issue.