Just in case anyone else finds this issue, apparently you can receive this error also when trying to connect to MySQL on the wrong port number.
"PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away"
Fixed
9.1
Last updated
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Just in case anyone else finds this issue, apparently you can receive this error also when trying to connect to MySQL on the wrong port number.
"PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away"