Factorio Forums

Symptom:

I copy from a blue factory to a grey or vice versa and get the paste is incorrect.
Green science from a blue becomes copper wire in a grey, and vice versa. Maybe it's pasting the last thing pasted to the same color factory? Not sure.

Severity: Low
OS: Windows 7

I also had this, but then I found that seems you cannot copy between different tier of assembler.
in other words, you can only copy gray on gray and blue on blue, etc.

when you press shift and hover on a candidate "destination" assembler, you can see a green box around "source" assembler. In my case this box was around an assembler of the same tier of destination (ie: hovering on a blue assembler the green box was around another blue assembly machine).

arl85 is correct. From the point of view of the engine different assemblers are different entities. They can have different properties and copy / paste might not be possible at all. So this is not a bug.