What did I do?
I opened up a machine (in this case a foundry) which already had the steel recipe selected. As expected, the steel foundry has a single output ingreedient (steel) which was being filled like normal. Then, whilst in the machine, I chose the "change recipe" button which brought up the recipe list for foundries, and simply reselected the same exact steel recipe. This brought me back to the main foundry screen like before, however this time there were two slots for the steel output! Repeating this process again, my foundry now has 3 output slots for steel! One more time and it now has 4 slots filled with steel. Going further does nothing at this point.
Out of curiosity I tried this out with other machines, namely the electromagnetic plant with the advanced circuit recipe selected. Applying the same process as with the steel foundry, if I reselect the advanced circuit recipe it gets way weirder this time... Not only does it add a new output slot for advanced circuits, it also adds a new output slot for every single ingredient for the recipe to make advancec circuits (see screenshots). So the electromagnetic plant now has 5 output slots instead of 1 (2 for adv circuits, 1 green circuit, 1 copper wire, 1 plastic). Very strange indeed. I don't know of other cases where this happens (simply because I haven't tested them), but I would assume that this happens for any machine that can be configured with a recipe.
What did I expect to happen?
Reselecting the same recipe in a machine should simply just keep that recipe. No extra slots should be added to the outputs, especially not slots for ingredients.
How often does this happen?
Consistently every time as far as I can tell.
EDIT: It doesn't happen with assemblers. I know it happens for foundries and EM plants
EDIT2: It looks like this issue only happens when the machine already has items in the output slots. It doesn't happen if the output slots are empty. In this case, if this is intended behaviour, I would suggest that instead of adding multiple output slots for the items that are filled in the machine, that instead the machine spits the items out onto the floor like what happens when other containers have too many items (for example the cargo platform. When it overfills with items it just spits them out onto the ground).
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