When you duplicate a master layer (the + button), the layer you are on stays focused. If however you are on a brace layer and duplicate it, it focuses (in the edit view and the layers panel) the duplicate layer you just created instead of keeping the intermediate master layer focused. Is this newly introduced / possibly a bug? It makes things a bit tricky when jumping between masters, editing things, creating backup layers etc (I’ll duplicate a brace layer to back it up, and then accidentally start editing the duplicate instead of the master itself, as if the behavior were the same as a normal master)