Chrome Download Attribute not working to replace the original name

After some research I have finally found your problem.

<a>‘s download attribute:

If the HTTP header Content-Disposition: is present and gives a different filename than this attribute, the HTTP header has priority over this attribute.

If this attribute is present and Content-Disposition: is set to inline, Firefox gives priority to Content-Disposition, like for the filename case, while Chrome gives priority to the download attribute.

Source

HTTP-Header Content-Disposition