Feed does not always include featured image in masonry themes

After trying MANY plugins, I love your plugin. Thank you.

The posts created by the rss feed do not always “display” the image on the posts archive page. The detail page is linked back to the original url, so I don’t know if the featured image would display in the detail post.

If I open the edit window for a post that is missing an image, the image appears in the body of the post identically as the image appears in a post that does display an image correctly.

I have cleared cache, reset the feed settings and the same feeds are missing the photo.

I have changed the theme to many different themes. The ONLY themes that consistently display all the images are the core WordPress themes. As soon as I activate a masonry theme, I get missing photos.

Help???? I am at the end of all I know. Who knew rss could be SO complicated!?!?!

Thanks.

https://wordpress.org/plugins/feedwordpress/