Problem with $unset function

[Pianca82]

I am using this script to preserve the content of some tags and it always works fine
$foreach(%keep%,$unset(%_loop_value%))

I was creating another script but I noticed that if I try to copy one of the values contained in keep, it does not copy anything.
Eg: %keep% contains engineer → $setmulti(newtag,%engineer%) it creates nothing

Does this mean that the $unset function does not allow you to copy the content of that tag into another?

is there an alternative way to do this?

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