Exception on using BulkInsertQuery with a read-only & read/write database configuration

[twaurisch]

We receive an exception while using EXT:mysqlreport with a splitted database configuration. In our TYPO3 instance we have two database hosts configured. One is read-only which is the default for the frontend nodes.

For the table 'tx_mysqlreport_domain_model_profile' an exception is configured. For this table the read/write host should be used, but it seems to be ignored.

Default = read-only
Backend = read/write

$GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Backend'] = $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default'];
$GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default']['host'] = $readOnlyDbHost;

// create a white-list for the 'write' tables => 'Backend'
$GLOBALS['TYPO3_CONF_VARS']['DB']['TableMapping'] = [
    // EXT: mysqlreport
    'tx_mysqlreport_domain_model_profile' => 'Backend',
    ...
];

Exception while making a frontend request

Fatal error:  Uncaught mysqli_sql_exception: The MariaDB server is running with the --read-only option so it cannot execute this statement in /var/www/a/cs-content/vendor/doctrine/dbal/src/Driver/Mysqli/Statement.php:153
Stack trace:
#0 /var/www/a/cs-content/vendor/doctrine/dbal/src/Driver/Mysqli/Statement.php(153): mysqli_stmt->execute()
#1 /var/www/a/cs-content/vendor/doctrine/dbal/src/Connection.php(1207): Doctrine\DBAL\Driver\Mysqli\Statement->execute()
#2 /var/www/a/cs-content/vendor/typo3/cms-core/Classes/Database/Query/BulkInsertQuery.php(187): Doctrine\DBAL\Connection->executeStatement()
#3 /var/www/a/cs-content/vendor/typo3/cms-core/Classes/Database/Connection.php(229): TYPO3\CMS\Core\Database\Query\BulkInsertQuery->execute()
#4 /var/www/a/cs-content/vendor/stefanfroemken/mysqlreport/Classes/Helper/ConnectionHelper.php(80): TYPO3\CMS\Core\Database\Connection->bulkInsert()
#5 /var/www/a/cs-content/vendor/stefanfroemken/mysqlreport/Classes/EventListener/RegisterDatabaseLoggerEventListener.php(111): StefanFroemken\Mysqlreport\Helper\ConnectionHelper->bulkInsert()
#6 [internal function]: StefanFroemken\Mysqlreport\EventListener\RegisterDatabaseLoggerEventListener->__destruct()
#7 {main}