I was sent a link to approve changes to a branch. The branch review overlay displayed thumbnails of each change, however nothing was visible in each thumbnail image. Clicking into the thumbnail to show the side by side diff also didn’t display anything.
I had to close the review overlay and manually open the changed pages to load in the content and then return to the branch review overlay via the “Review and merge changes” menu item before any changes were displayed.
Same problem in both the app and in browsers.