apt-get source saying I must have a deb-src... I have one

[Paul Dufresne <dufresnep@zoho.com>]

root@debian:~# cat /etc/apt/sources.list
# deb cdrom:[Debian GNU/Hurd sid _Sid_ - Unofficial hurd-i386 DVD Binary-1 20220226-09:55]/ sid local main

deb cdrom:[Debian GNU/Hurd sid _Sid_ - Unofficial hurd-i386 DVD Binary-1 20220226-09:55]/ sid local main

deb http://deb.debian.org/debian-ports/ sid main
deb http://deb.debian.org/debian-ports/ unreleased main
deb-src http://deb.debian.org/debian-ports/ sid main
# 'unreleased' does not support sources yet
# deb-src http://deb.debian.org/debian-ports/ unreleased main
root@debian:~# apt-get source git
Reading package lists... Done
E: You must put some 'deb-src' URIs in your sources.list
root@debian:~# apt-get source hello
Reading package lists... Done
E: You must put some 'deb-src' URIs in your sources.list
root@debian:~# apt-get source kasjfjklsdfj
Reading package lists... Done
E: You must put some 'deb-src' URIs in your sources.list
root@debian:~# 

At first I encounter this with daily image, but this one is 20220226... but then if I upgrade, I get... daily version?
I kind would expect a different repos for released version... but I  am still a bit confused.

The goal was to get xserver-xorg  source code to investigate the problem with int 10 making it to not start.