JIRA OnDemand - Rich Text Display - Integers immediately preceded by the letter 'r' display as null strings

JIRA OnDemand - Text Display - Integers immediately preceded by the letter 'r' display as null strings

Steps to Reproduce

1. Create an issue
2. Enter the following text into the Description field: "r12345"
3. Submit the issue
4. Enter the following text into the Comments field: "r12345"

Expected Result:
User-defined text displays as entered, with any Wiki Markup formatting applied

Actual Result:
The string does not display at all (null string) for either the Description or the Comments field

Impact:

• Developers are used to entering references to changes they make by referring to a specific commit revision
• They are in the habit of writing this in the format: "r#####" (e.g. "r12345")
• If they maintain this habit, JIRA currently does not display this crucial information

Notes:

• If you go back to edit the field, the text is still there
• This appears to be a relatively new issue, I've only noticed it happening within the past week or so (current date is 27-JAN-2014); I feel like I probably would have noticed this behaviour sooner if it had been happening for a longer time
• I have taken a look in the JIRA Admin panel and can't see anything obvious that could be causing revision references in this format to fail to display
• The project affected can be found at warchest.atlassian.com
• We have many non-default add-ons installed (FishEye, Cruciple), but we don't actively use any of them as far as I can see