When using 

<f:repeatable header="Header">

the header text is shown but the drag&drop handle is missing for existing entries. The handle is properly shown for newly added entries.

Steps to reproduce

1. Install sidebar link plugin
2. go to "Manage Jenkins" -> "Settings"
3. Add 2 links for the Sidebar
4. Save
5. go to "Manage Jenkins" -> "Settings"
6. Add a Sidebar link

During Step 3 and Step 6 the newly added links can be moved, in step 6 for the existing links the drag&drop handle is missing, but the Header text is shown.

Most likely caused by https://github.com/jenkinsci/jenkins/pull/5923