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Source line 1834 of /var/www/zotero/model/Item.inc.php
After confirming that the database encoding is set correctly, look for errors in Zotero_DB ::query(), after testing, it is determined that the encoding is set incorrectly in line 252 of /var/www/zotero/include/DB.inc.php, and the error is eliminated by changing utf8 to utf8mb4.