1. Add several image variations.
2. Create a new article and embed an image in the body field. Depending on the position of the richtext field within the browser view, the selection of the image variation is cut off, see the screenshot and note the gray background color at the top above medium, where a cut-off item is hovered.

Note:
The variation selection popup is not scrollable, so when there are many possible variations, some are outside of the browser window and thus get cut off.