Created attachment 1779516 [details]
Description of problem:
When you select a specific mirror, the AppStream repo is added to the Additional Repositories automatically. However, when using "Closest Mirror" it is not.
Version-Release number of selected component (if applicable):anaconda-188.8.131.52
How reproducible: 100%
Steps to Reproduce:
1.Boot from boot.iso
3.click on "Software Sources"
AppStream not listed
Things work as expected when you select a specific mirror
I tried it with CentOS-Stream-8-x86_64-20210503-boot.iso, and although there is no AppStream repository listed on the Installation Source spoke for "Closest Mirror", the Software Selection spoke shows environments like "Server with GUI", which come from AppStream.