I faced with an issue that dnf doesn't see source RPM when working with packages from AppStream repository. For example,
dnf repoquery --srpm -l nginx returns nothing
dnf download --source nginx returns the following error:
No package nginx-1.14.1-9.0.1.module+el8.0.0+5347+9282027e.src available.
Exiting due to strict setting.
Error: No package nginx-1.14.1-9.0.1.module+el8.0.0+5347+9282027e.src available.
Other AppStream packages, e.g. varnish, nodejs or freeradius are also affected.
I know that srpm can be manually downloaded from Oracle yum server, but this is not a convenient way.
Please note that upstream has no such issue.