Confluence renames the attachments to something it can handle because you can't have two files with the same name in the directory and it needs to version the copies. It also dodges previous problems with unusual characters in file names, non-standard character sets and so on.
I think the question I'd need to ask is "why does it matter to you?" The files handed over in the UI and by REST are named fine, and you shouldn't care how Confluence handles them internally.
Oh, this downgrade again, I thought you'd finished that ages ago. There is no easy route to do this. You're going to need to read each issue in Jira or Page in confluence for their attachments, getting the version you want (all of them?) then extracting the physical file name.
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