Bug oembed API response is not fully compatible with the spec

[Kirby]

https://xenforo.com/community/api/oembed/?url=https://xenforo.com/community/threads/boosting-performance-in-xenforo-2-3.216767/ returns the following response:
Code:

{
    "version": "1.0",
    "type": "rich",
    "provider_name": "XenForo community",
    "provider_url": "https://xenforo.com/community",
    "author_name": "Chris D",
    "author_url": "/community/members/chris-d.11388/",
    "html": "<div class=\"js-xf-embed\" data-url=\"https://xenforo.com/community\"...

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