Thank you for your report. Here is how to address the issue.
When you post a regular link, the preview is displayed in the site’s default language (Japanese), so even English posts are embedded in Japanese. Due to the specifications of the social media platforms, it is not possible to automatically set this to “original language via regular link.”
However, you can display the preview in a specific language by appending “?tl=(language code)” to the end of the URL.
English: False Arcade Project (Game Collection)
Japanese: False Arcade Project (Game Collection)
Chinese: False Arcade Project (Game Collection)
Please use this format when you want to share in a specific language!