Attachment Link in the comment pointing to the older attachment instead of the latest

This problem is replicable in JIRA 4.2 and JIRA 4.2.1. But it does not occur in JIRA 4.1.2 and below. To replicate in JIRA 4.2:

1. Create a ticket
2. attach a file. For example, "test.txt"
3. add a comment [^test.txt] to the issue.
4. attach another file also called "test.txt"
5. download the attachment by clicking on the link in the comment. The older file will be downloaded.

In JIRA 4.1.2,

1. Create a ticket
2. attach a file. For example, "test.txt"
3. add a comment [^test.txt] to the issue.
4. attach another file also called "test.txt"
5. download the attachment by clicking on the link in the comment. The latest file will be downloaded.

For more details, refer to the screenshots attached.