For sites updating to latest stable major release of drush 11 one will see the following debug output.
[debug] acquia_search commands loaded even though its constraint (^9 || ^10) is incompatible with Drush 11.x. Broaden the constraint in modules/contrib/acquia_search/composer.json (see 'extra\drush\services' section) to remove this message.
Update the constraint syntax within the composer.json file as indicated.
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
For those wondering now this has been fixed on 3.1.x as well. Since 3.1.5 release.
See https://git.drupalcode.org/project/acquia_search/-/commit/2ec94249a21302...