Duplicate of https://answers.atlassian.com/questions/38057518
Instead of copying the scripted, why not just add a post-function called "Update parameters of the Set Field Value to constant or Groovy expression Function for this transition."
"The value of field <custom_field> of the current issue will be set to the result of a Groovy expression (unless the field already has a value)."
This way, the value will not be duplicated.
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