Reporting this here even though it's an upstream issue. With the removal of restricted_html, the rules module can fail to work properly because it has the text format hard coded in some areas -- https://git.drupalcode.org/search?group_id=&project_id=59473&repository_...
Closed: outdated
9.0
Miscellaneous
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It's likely this issue predates Contrib.social: some issue and comment data are missing.