Perl strikes me as the only major language which failed a transition though. I mean where the actual developers of a language developed a new version, released

Perl strikes me as the only major language which failed a transition though. I mean where the actual developers of a language developed a new version, released as an official new version of the language, and then the entire community stayed behind on the old version to the degree that the new version was renamed and made into its own separate project. Can you think of any other example?