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I verified this isn't the same as 118474. When using a parameterized blueprint with Set Recipe checked on a Foundry and selecting either Molten iron or Molten copper from the Intermediates tab, a Foundry will set the Molten iron/copper from lava recipe instead.

If you click to change the circuit signal in the Constant combinator set via the parameter, it has Molten iron/copper from the Fluids tab selected despite the fact the selected recipe was from the Intermediates tab.

If I manually set the value of the recipe in the Constant combinator, it works as expected.

Ref 123133 Signal Parameterization Issue: Incorrect Signal Behavior After Blueprint Application.

There are confusingly two signals named "molten iron" one is an "intermediate product" the other is a "fluid". I used the intermediate product one in the constant combinator.

If I use the "intermediate product" signal on the combinator this is what I guet:
Copy blueprint But using the "fluid" gives me a blueprint with two paramaters: Manually making both paramaters "paramater 0" however gives me a blueprint that works identically to the first one:
Copy blueprint

Not a bug.