The Expanded Universe, or EU, was getting rather out of hand, so by wiping the slate clean, Lucasfilm is able to cherry pick what they want to bring back to become official Star Wars canon, and Solo brings back two obscure deep cuts from the EU.
Solo: A Star Wars Story is currently in theaters and many fans find the film to be a fun movie that colors outside the lines of the regular Star Wars projects.
The decision was met with hostility by many hardcore Star Wars fans, but the choice has proven to be wise over the years.
The next obscure EU reference in Solo comes after Han Solo and crew flee Kessel with the Unrefined Coaxium.