oEmbed / OpenGraph display issue in post previews

https://viewer-trial.bookwalker.jp/03/8/viewer.html?cid=cfc75d44-04b8-4ac5-8d1f-0e673b8ed994&cty=0

The above link shows up strangely in post previews. I’ve seen this numerous times over the last few weeks. It shows up correctly (as a raw link) in the actual post.

The notice you are seeing in the preview window is telling you why a onebox cannot be generated for the link. You should only see this behaviour if you paste the link onto its own line in the composer - the same way as you would if you were trying to create a onebox for the link. The goal with this is to let the user know why a onebox is not being generated.

What you are seeing is the expected behaviour, but knowing that the expected behaviour is causing confusion is good feedback.

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Okay, that’s good to know. It’s definitely confusing to me. I would expect the post preview to always match the final post.