LiveSearch macro double-encodes filenames with non-latin characters

Steps to Reproduce

1. Attach a file with this name: FDS_Myška.txt
2. Add a livesearch macro to a Confluence page
3. Search for this via the livesearch macro: "FDS_Myška.txt"
4. Try to click on the attachment in the search result

You will get a Page Not Found.

Cause

The generated URL is this: http://localhost:8571/c571/download/attachments/1572869/FDS_My%25C5%25A1ka.txt (double encoded)

When it's supposed to be this:
http://localhost:8571/c571/download/attachments/1572869/FDS_My%C5%A1ka.txt