Investigate: M_musculus_Jun_2020 genome listed in Track Hubs table?

The new track hubs table available at https://www.bioviz.org/public-trackhubs.html lists an IGB name "M_musculus_Jun_2020" for a mouse genome version.

However, this genome was not available in the IGB interface.

I tried to visit the genome version by opening the Current Genome tab. I then selected species Mus musculus using the Species menu. However, the genome version name "M_musculus_Jun_2020" did not appear in the Genome Version menu.

For this task, please investigate. Is there a problem with how the genome version names are getting picked up by the Table javascript code? Does a change need to be made in IGB? Do we need to add this genome version to the Quickload system?