As designed Copy Paste Videos is not working

I copied this post
below and paste in rich editor.
When pasting, video shows up, then in preview mode the video is not there anymore and also not if post is published.

Used Google Chrome.

XenForo 1.4 includes a complete and extensible implementation of the Sitemap XML standard, allowing for optimised indexing of your site by search engines.

for like SEO and stuff...

Watch on Vimeo

As always, please don't post suggestions in this thread, but rather use the appropriate suggestions forum.
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