修复

app/services/api/v1/issues/update_service.rb

@@ -58,7 +58,7 @@ class Api::V1::Issues::UpdateService < ApplicationService
       @updated_issue.assigners = @assigners || User.none unless assigner_ids.nil?
       @updated_issue.attachments = @attachments || Attachment.none unless attachment_ids.nil?
       @updated_issue.issue_tags = @issue_tags || IssueTag.none unless issue_tag_ids.nil?
-      @created_issue.issue_tags_value = @issue_tags.order("id asc").pluck(:id).join(",") unless issue_tag_ids.nil?
+      @updated_issue.issue_tags_value = @issue_tags.order("id asc").pluck(:id).join(",") unless issue_tag_ids.nil?
 
       @updated_issue.updated_on = Time.now
       @updated_issue.save!