Don't ask me why and don't ask me why today after several attempts I managed to unlock the situation and get out of this bug that, honestly, was leading me to abandon Guild wars 2 after more than 12 years (not counting Guild wars 1..). I solved it by entering the development Lab (as requested), exiting, interrupting the story, going to another instance, returning to Rata Sum, starting the SoOb episode "Duress", leaving it, restarting the bugged episode (the prologue precisely), and returning to the Home. Thanks to myself.