Chouby on "[Plugin: Polylang] Changing language via quick or bulk edit breaks translation linking"

I am aware of this. I kept things simple. As soon a you change the language, Polylang intentionnaly breaks links (to avoid that two posts in the same language get linked). Checking if the language is not already used in the group and not to break links in this case is an improvement that I will keep in my todo list for the future.