Content rendered in Full may be previewed by clicking the 'Preview' button. However this does not appear to properly render a Flag on the Full content type.
Steps to recreated:
Needs work
4.0
Flag core
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
The patch will have to be re-rolled with new suggestions/changes described in the comments in the issue.
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.