thisisaridiculouslylongdomainnamemadeonlytotestyourlinkpreviews.international
This name is 77 characters long: 63 before the dot, which is as many as the DNS allows in one label, and a 13-letter top-level domain after it.
Everything else about this page is right. The Open Graph tags are complete, the poster is 1200 by 630, the og:video is a six-second MP4 that plays in iMessage, and there is a favicon. So whatever your app does with this link, it is reacting to the length of the name and nothing else.
Try it
Paste the link into iMessage, Discord, Slack, X, WhatsApp, Telegram, or anywhere else that makes a preview. Then look at what the crawlers saw.
Check this page on checkmyog.comWhat the page carries
og:image. A 1200 by 630 PNG, with alt text.
og:video. An H.264 MP4, six seconds, no audio, faststart, served with range requests.
twitter:card. summary_large_image, so X shows the large card.
The rest. A title, a description, a canonical URL, a site name, a favicon, and https.
Why it exists
Dayward AI made it as a stress test for checkmyog.com, which shows how a link will look in each app before you share it. Both are open source.