While I was changing the contact form page, I realized that the image in evidence can no longer be removed.
If I try to remove it, the image remains on the article or on the page. At most I can replace it with another image or delete the same image from the media folder.
Even if I delete the picture by the media folder and then I upload in the same folder, the post or the page remember its file name and re-insert in evidence.
Obviously, if I change the image file name, this does not happen anymore.
What should I do?