When using the "Authored by" display for a node's author, if the node's author's user account was removed and the content reassigned to Anonymous, the "Authored by" displayed value still links to a user /user/0, which gives Access Denied, because Anonymous shouldn't be linked to a user's account.
It also just says "Anonymous", not the typical "Anonymous (not verified)".
Closed: cannot reproduce
1.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.