Assigning an og:image to a Post - specifically for Facebook Post Thumbnails

Does anyone have an easy and consistent way to assign a correctly cropped image for Facebook? I’m using Yoast SEO and this has turned into a hit-and-miss solution for me. Sometimes it’s cropped right, sometimes it’s not. Sometimes it doesn’t seem to work at all.
And am I the only one who gets incorrect thumbnails from Facebook Debugger? Lately the image it originally shows is never what I end up with.
And one more quick question… Has anyone had tried using a Wordpress thumbnail of an image as Facebook post thumbnail? Sometimes I just need a scaled down version of my Wordpress Post Image and some thumbnails that have already been generated would be perfect but how could I assign them as the og:image?

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