Description field and Activity Tab is empty when using custom Project Key Pattern

Steps to reproduce:

1. install a new vanilla JIRA instance
2. create a new project. Let's say with key "ADD"
3. create a ticket with description "tea". Issue Key ADD-1
4. create another ticket (ADD-2) with description contain:

   Try to find a point where there is some load (BT off, LEDs on, display on)
   

   Refer to screenshot Description-Edit.png

5. change Project Key Pattern via Administration > General Configuration > Advanced > jira.projectkey.pattern to:

   ([A-Z][A-Z]+)|(PJ[0-9]{4})
   

6. try to create a new Project with key "PJ0223". JIRA doesn't throw any error.
7. go to both ADD-1 and ADD-2. ADD-1 is correct as shown in ADD-1.png. However, ADD-2 will have the description broken as shown in the screenshot Description-View.png
8. JIRA also throw following error if :

   2012-03-26 21:33:07,110 http-8084-2 ERROR admin 1293x162x1 9tevgj 127.0.0.1 /browse/ADD-2 [atlassian.renderer.v2.V2Renderer] Unable to render content due to system error: String index out of range: -1
   java.lang.StringIndexOutOfBoundsException: String index out of range: -1
   	at java.lang.String.substring(String.java:1931)
   	at java.lang.String.substring(String.java:1904)
   	at com.atlassian.jira.issue.fields.renderer.wiki.links.JiraIssueLinkRendererComponent.linkBugKeys(JiraIssueLinkRendererComponent.java:77)
   	at com.atlassian.jira.issue.fields.renderer.wiki.links.JiraIssueLinkRendererComponent.render(JiraIssueLinkRendererComponent.java:26)
   

   or

   2012-03-26 21:23:40,665 http-8084-2 ERROR admin 1283x107x1 9tevgj 127.0.0.1 /browse/ADD-2 [webwork.util.ValueStack] METHOD: "renderedContent", exception: 
   java.lang.StringIndexOutOfBoundsException: String index out of range: -1
   	at java.lang.String.substring(String.java:1931)
   	at java.lang.String.substring(String.java:1904)
   	at com.atlassian.jira.util.JiraKeyUtils.linkBugKeys(JiraKeyUtils.java:372)
   	at com.atlassian.jira.issue.fields.renderer.text.DefaultTextRenderer.render(DefaultTextRenderer.java:20)
   

This is tested in JIRA 4.4.3