Having the same issue with:(Blogs, Video) Photo and Event work

Title and Description working...
Please advise how to fix missing og:image

Here is the issue with the code. When you view source when sharing a photo, all of the meta names are correct. For example

<meta name="og:image" content="https://mysite.com/ow_userfiles/plugins/photo/photo_10.jpg" />

However when sharing on the video page for example, the default og:image is used for Meta Name and Meta Properties. It should use the video thumbnail 

We had the same scraping issue and found this to work quite well
Go-to your addthis account ... setup your desired buttons... get the unique code snippet and paste it into your sites page settings, body html. Then paste the code below into a "html box"anywhere on a customisable page. (depending on the theme, use the sidebar if you want it to appear on all pages)
<!-- Go to www.addthis.com/dashboard to customize your tools --> <div class="addthis_sharing_toolbox"></div> .

Hope this helps
BTW don't forget to disable or delete this Social media sharing plugin before trying this.