JIRA gadget disappear from the macro browser

Steps to reproduce the issue:

1. Add the the JIRA gadget feed to Confluence.
2. Shutdown JIRA and keep Confluence running.
3. Restart JIRA.

Expected behaviour

The JIRA gadgets should be searchable via macro browser.

Current behaviour:

All JIRA gadget macro is gone from the macro browser

Workaround solution

Restart Confluence to let version 5.9.x to pick up the gadget macro list again.