I tried to change the help text of a field with Scriptrunner Behaviours according to https://scriptrunner.adaptavist.com/5.3.1/jira/behaviours-api-quickref.html with setHelpText(), but it somehow adds an additional red text, instead of replacing the small gray text under the field.
How can I do this?

My initializer script:
import static com.atlassian.jira.issue.IssueFieldConstants.*
import com.onresolve.jira.groovy.user.FieldBehaviours
import groovy.transform.BaseScript
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.user.UserLocaleStore
@BaseScript FieldBehaviours fieldBehaviours
def currentUser = ComponentAccessor.getJiraAuthenticationContext().loggedInUser
def userLanguage = ComponentAccessor.getComponent(UserLocaleStore).getLocale(currentUser).language
def summaryLabel = "Staff Member Name"
def componentsLabel = "Organizational Unit"
def katTeamLabel = "Kanban Team"
def katTeamHelp = "Optionally define of which interdisciplinary teams the employee is part of."
getFieldById("summary").setLabel(summaryLabel)
getFieldById("summary").setRequired(true)
getFieldById("components").setLabel(componentsLabel)
getFieldById("customfield_12430").setLabel(katTeamLabel)
getFieldById("customfield_12430").setHelpText(katTeamHelp)