So unfortunately, this is a game break bug that is going to take some time to fix. I have to redo the coding for the entirety of that chapter. You can get past it by making a few different choices in your route but I think you got the very specific route that sits on an even rating for what you had to do in the chapter, so your mirror doesn't break or stay whole and trigger the events. I'm going to get it fixed for my final Steam release but it probably won't be fixed in the wip format. I'm so sorry.