Confluence HTML Macro breaks Jira Release Notes links

Summary

After generating Jira Release Notes as HTML. Copying the generated HTML into an HTML Macro in Confluence, breaks the links on Firefox and Chrome.

Environment

Bug reproduced on:
Confluence 5.8.18 and 5.9.8 using Chrome 48 and 50.0.2661.75 AND Firefox 45.0.2
Bug not reproduced on IE11

Steps to Reproduce

1. Login to Jira
2. Browse to a specific Project
3. Click on Versions or Releases (if using Jira Agile)
4. Select a specific version (by clicking on it)
5. On the top right, click on Release Notes
6. Configure Release Notes and select HTML
7. Copy the generated HTML code (Make sure to include the bugs links)
8. Login to Confluence
9. Create a new Page
10. Insert an HTML Macro (if not enabled, go to System Add-ons and enable html-xhtml
11. Paste the HTML code there
12. Preview the page

Expected Results

Links to the tickets should be correct

Actual Results

Links to the tickets have the ticket id as a prefix of the http link.

Example

Jira Release Notes HTML sample:

<li>[<a href='http://localhost:8080/jira/browse/TEST-123'>TEST-123</a>] Some text here </li>

Confluence HTML Macro result:

<li>[<a href='TEST-123http://localhost:8080/jira/browse/TEST-123'>TEST-123</a>] Some text here </li>

Workaround

There are currently 2 workarounds:

1. Manually edit those links
2. Use IE to copy the HTML Release Notes