Below is the support question posted on Discourse (February 26, 2021, 12:38am) for assistance but it was removed after 5 days for unknown reason.
tried the twitter card validator and it is showing this message
INFO: Page fetched successfully
INFO: 19 metatags were found
INFO: twitter:card = summary tag found
INFO: Card loaded successfully
WARN: The image URL https://example.com/uploads/default/original/1X/c1a344b02aa046908b753784889a4be525616c28.jpeg specified by the ‘twitter:image’ metatag may be restricted by the site’s robots.txt file, which will prevent Twitter from fetching it.
could upgrade from a very old version be the cause of this?
if not, can you let me know what to check?