I was re-watching The Emperor's New Groove and noticed that it used the old Disney castle intro where the castle is filled in on a blue background from the top down. This is different than the Disney castle intro to Hercules which uses the CGI landscape castle. I checked and found Hercules came out 3 years before Emperor's New Groove and almost a decade before that intro was used on another movie for the first time. Did Disney change the intro to Hercules when it was released on blu-ray or was the CGI logo first introduced with this movie?
This page documents the evolution of the intro logo. The full cgi logo was first used in 2006 with Pirates of the Caribbean: Dead Man's Chest. Further down under the 2011 variant it says this:
Later reissues of classic Disney movies released on DVD and Blu-ray began using this or the original 2006 variant.
So Hercules originally used the 2D version, but was later changed for rereleases.