I am having an issue with the 'Embed' web part. When pages are loaded/refreshed, all the embedded contents have a gray preload box over them. For example, we have a social media feed and Vimeo video embedded on the page. They have a gray box overlay as the page is loaded or refreshed, but the box goes away as soon as users hover over the box. We noticed the issue less than a month ago.
Does anyone have the same issue or know why it is happening? Is there a setting to get rid of the box overlay?
Here are examples of the gray box over the Embed web part.
Here are the examples after the hover. The embedded contents are loaded and rendered correctly.
Thank you in advance.