The LinkedIn post inspector doesn’t seem to see the og:image tag properly, but it does show up when inspecting the page. On deeper look the Facebook debugger seems to point to the use of ‘name’ instead of ‘property’ for the meta tags.
Tag specified as ‘name’ instead of 'property’
The following meta tags are specified using ‘name’ instead of ‘property’ and will be ignored unless specified using the ‘property’ key: og:type, og:url, og:title, og:description, og:image
It’d be awesome to get this fixed for using Glitch as a portfolio as well as a learning/creative tool. I’d be open to peaking into it as a PR if this is part of the community site, but will give it another look in the next few days. Thanks!