If media testing is selected during the installation, the disc gets ejected. This shouldn't happen unless additional media testing is requested (which is the next question asked).
When this happens during the installation under KVM (virt-manager), the virtual CD drive doesn't get disconnected upon eject command being invoked, but the installer can no longer find the media to install from. Installation can only resume after the virtual DVD image is unmounted and re-connected in virt-manager.
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We eject the media on purpose so if you have multiple discs in the set, you have an easier time of switching them out.
Shouldn't this happen _after_ the user has confirmed that there are other media they want to test, considering that is the very next question the installer asks? Also, what other media could there be when the DVD distribution is used?