Certainly. In general, anything named "Gadget" or "Item" is not going to be supported on the new Editor. You can also click the placeholder in the new editor, when you click a placeholder, a frame will appear on the left of the screen where you can select the content of those placeholders. If you are unable to edit the content, then this is an unsupported Gadget or Item.
You can also view a full list of unsupported items here.