After getting the latest Sketch (Version 50) update this morning and then getting the latest Craft update the duplicate function stopped working. Clicking the duplicate button creates a new Group folder but nothing gets duplicated. I first tried using the custom data tab, then selecting duplicate, it didn't work. I then tried to mask an image using the data tab to locate images on a local folder. That didn't work. then I tried to simply add some vector shapes. Clicking on each shape then selecting duplicate. Nope. Not working!