Hmm. Yeah idk why the height is wrong. The image size is actually ok. When I try to embed the post in WordPress it looks fine.
Either way, the blockquoted link above the embed should be hidden, right?
blockquote.wp-embedded-content {
display: none;
}
Height appears to be 338 for anything (notice the whitespace below this embed):
It resizes inside of WordPress posts though (visit that link and watch the page load). So maybe there’s something going on in Discourse preventing it from resizing correctly?