All the pages have their featured image, and in the Yoast SEO the image was seen in the preview of the backend, until now. I can’t find if jetpack or another plugin has caused it to disappear and I would like to know if you can help me from your experience. Would it be possible that I had changed something unintentionally in the theme settings?
Deactivate the plugins and activate them one by one to detect which one influences. I do not have instruction for that as it does not relate to the theme if the plugins do not conflict, check the plugin documentation on this issue.