Zitat (voom)
[Wed Jan 27 15:03:47.003943 2021] [proxy_fcgi:error] [pid 41396] [client 89.0.20.209:53369] AH01071: Got error 'PHP message: PHP Fatal error: Uncaught PDOException: SQLSTATE[08S01]: Communication link failure: 1153 Got a packet bigger than 'max_allowed_packet' bytes
[...]
There you have it: Try increasing the MySQL server variable "max_allowed_packet" (16M should be fine).