Steps to reproduce the issue

Use a J 6.x site to fetch an extension update.

Expected result

User agent is sent like in Joomla 5.x:

x.x.x.x - - [15/Oct/2025:14:53:20 +0000] "GET /path/to/file.zip HTTP/2.0" 200 65119 "-" "Mozilla/5.0 Joomla!/5.3.3 Joomla"

Actual result

User agent is missing:

x.x.x.x - - [15/Oct/2025:14:56:29 +0000] "GET/path/to/file.zip HTTP/2.0" 403 28 "-" "-"

Additional comments

The missing agent causes WAFs to block traffic.