We provide a link with twitter card. (summary_large_image) You can see many tweets in this link: https://twitter.com/search?q=멘탈진단&src=tren
But some of tweets does not show image specified in the twitter:image meta tag, while others shown correctly.
For example, card image is not shown on following link: https://twitter.com/alexhong1007/status/621150362376929281
In validator, all information is fine (link of above tweet: http://t.co/H0LyS2dkfp)
INFO: Page fetched successfully INFO: 36 metatags were found INFO: twitter:card = summary_large_image tag found INFO: Card loaded successfully
This tweet is made in in-app browser of twitter app 5.65.0 of android 4.4.2.