I'm not surprised at these shenanigans. The bookmark is plainly not pleased with an essay I just wrote, the essay in which I disparage store-bought bookmarks and mention how seldom I use them. In fact, I'm only using this one because my current journal does not have its own built-in bookmark.
I could repair this marker. I could collect the slender threads and attempt to reattach them. But since I spent much of yesterday tied in knots (see below), I'm unlikely to do that today.
Does a bookmark know when it's been thrown under the bus? Apparently, it does.