Adding an attachment with an identical file name will change all existing references in a request

Summary

If an attachment gets added to a customer request, which has an identical name to another attachment under the same request, all existing references to the original attachment will get adjusted to reflect the new attachment.

Steps to Reproduce

1. As a customer, add an attachment to a request. From the customer view, this issue will have a linked url displayed as <baseurl>/servicedesk/customershim/secure/attachment/<attachmentID1>/<attachmentID1>_<attachmentname>
2. As an Agent, add an attachment to the same request, and choose "Add to issue only". The file name should be identical to the file as attached under step 1. This attachment is not visible from the customer view

Expected Results

The attachment added by the customer should remain being displayed as <baseurl>/servicedesk/customershim/secure/attachment/<attachmentID1>/<attachmentID1>_<attachmentname> and be accessible as such.

Actual Results

The url referencing the attachment in the customer view has changed to <baseurl>/servicedesk/customershim/secure/attachment/<attachmentID2>/<attachmentID2>_<attachmentname>

Notes

For the above setup, the files do not have to be identical, just the file name needs to be identical. This has been tested with both identical files, as well as with different files renamed to have identical names.