When building a package by initially setting the build options (not stored as a package yet), the dist-git source can be selected (fedora, centos, centos-stream etc.) and the build proceeds.

Looking after the settings in the "Packages" section afterwards:

Default Build Source

Source Type:
Build from DistGit
Distgit:
centos-stream
Committish:
c10s
Clone_Url:
https://gitlab.com/redhat/centos-stream/rpms/rubygem-asciidoctor.git

The Distgit: section is not stored when initiated through a build and is therefore re-set to "fedora". I have to manually go into the packages option and set the distgit for the default build again.

Steps to reproduce:

1. create a copr repo with centos-stream-10 as the build environment
2. build the above package with the according settings
3. check the package in the "Packages" section, the Distgit is missing now.