Pope Francis himself even clarified that the intent was to allow blessings for individual people in a same sex relationship, not same sex unions.
He also decided to allow Catholic priests to bless members of same-sex couples. Still, he has not allowed blessings of the union itself.
"The blessing is for everyone, for everyone," he said. "To bless a homosexual-type union, however, goes against the given right, against the law of the Church. But to bless each person, why not? The blessing is for all. Some people were scandalized by this. But why?"
https://www.cbsnews.com/news/pope-francis-interview-same-sex-couples-surrogacy-conservative-bishops-60-minutes/