Just an update. The first image is the bathroom where the ceiling is damaged. It looks like some wallpaper type, but at first I thought it is just artex, I don't know what it is. Then looks like plasterboard above. The second picture is what all the other ceilings in the house are like. I'm not sure if it's the same stuff as in the bathroom. https://imgur.com/a/qzTL2ZT