This patch is working, the README.txt replaced with README.md.
Replace README.txt with README.md
Update README.txt with README.md
follow this pattern
https://www.drupal.org/docs/develop/managing-a-drupalorg-theme-module-or... →
1.2
Documentation
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This patch is working, the README.txt replaced with README.md.