Update Fix Version of Linked issue using Scripted Listener

Update Fix Version.groovy

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.issue.link.IssueLink
import com.atlassian.jira.issue.link.IssueLinkManager
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.project.version.Version
import com.atlassian.jira.event.type.EventDispatchOption

import java.time.LocalDateTime
import java.time.format.DateTimeFormatter
import org.apache.log4j.Logger
import org.apache.log4j.Level
def logger = Logger.getLogger("com.acme.CreateSubtask")
logger.setLevel(Level.DEBUG)
def issueManager = ComponentAccessor.getIssueManager()
def versionManager = ComponentAccessor.getVersionManager()
final customFieldName = 'Fix Version/s'
Issue fix_Issue = event.getIssue()
def authenticationContext = ComponentAccessor.getJiraAuthenticationContext()
Collection<Version> fixVersions
def user = authenticationContext.getLoggedInUser()

if (fix_Issue.issueTypeObject.name == "Story" ) {
List changeItems = event.getChangeLog().getRelated("ChildChangeItem")
if( fix_Issue.fixVersions?.name && changeItems.any {it.get('field')=='Fix Version'} ) {
fixVersions = new ArrayList<Version>();
fixVersions = fix_Issue.getFixVersions()
logger.debug fixVersions
}
//return fixVersions
def linkedIssues = ComponentAccessor.issueLinkManager
.getOutwardLinks(issue.id)
logger.debug linkedIssues
.findAll { it.issueLinkType.name in ['Covers'] && it.destinationObject.issueType.name == "Story" }

log.info(linkedIssues)
if (!linkedIssues) {
    logger.debug "no issue"
return 
}

linkedIssues.each {
def linkedIssue = it.destinationObject
logger.debug linkedIssue
def newValue = fixVersions
versionManager.updateIssueFixVersions(linkedIssue, newValue)
issueManager.updateIssue(user, linkedIssue, EventDispatchOption.DO_NOT_DISPATCH, false)
}
}