It looks like shrinked paper , which is very common for multi finish. You can repair the crack by running Stanley knife along and it looks like someone has done it. That again is very common for multi . By the look of it , not sure if lime plasterer has done the job, but the person who has done it has very little, if not none, experience with lime. Timings and technics are screeming -skimmer. As for the last two pictures that's forced lime.No I didn't do this, plasterer has done this. Not sure I understand the multi finish question.