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At least, that's why I observe from my limited programming knowledge.

I'm building a train network. I did copy the iron stations and changed the requested item in a combinator (which is a copy of the iron station combinator, ctrl+C, ctrl+V in editor mode) and changed the requested item from iron to copper. This causes that the iron stations start to request copper as well.

[UPDATE] When using blueprints it happens as well.

Thanks for the report. I suspect you are using a named logistic section in which case any changes in them get propagated to any other entity with logistic sections of the same name. That is a feature. If you want logistic section to detach from the group you will have to clear section name.

Indeed, I just realized I had the constants inside a group of the same name in different combinators. The signal propagates even when they are not physically connected with wires. Could it be because of the radars?

Radars wire connections and named logistic sections are unrelated features that share no common parts.

Nice, thanks for the swift response. There are so much new features that this is like playing factorio for the first time.

Have a nice day boskid.