修复：无法根据root_id查询到对应issue

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

@@ -71,8 +71,8 @@ class Api::V1::Issues::ListService < ApplicationService
 
     #pm相关
     # root_id
-    if pm_project_id.present?
-      issues = issues.where(root_id: root_id.present? ? nil : root_id)
+    if root_id.present?
+      issues = issues.where(root_id: root_id).or(issues.where(id: root_id))
     end
 
     # pm_issue_type