Stock Marshmallow clock widget has disappeared

I was wondering if anyone else had this issue. I'm running stock 6.0.1 on a Nexus 6, and recently the clock widget disappeared. So, easy enough, I put it back on my screen. Today it disappeared again, but the widget drawer has also changed. It is sorted by app, and then each app has a list of one or more widgets to choose from. Clock is not listed as an option. Is this the same for anyone else? I would like my clock widget back.