File polling by Camel doesn't work as expected in fabric mode

Issue

The same file being processed by more than 1 consumer, despite an JdbcMessageIdRepository has been configured to prevent that.

Example of configuration:

<route>
<from uri="file:///mnt/tmp/in/?scheduler=quartz2&amp;scheduler.cron=0/1+*+*+*+*+?&amp;readLock=idempotent&amp;idempotent=true&amp;idempotentRepository=#messageIdRepository&amp;scheduler.triggerId=startPollingInbound&amp;scheduler.triggerGroup=#{triggerGroup:UUID}"/>
...
<bean id="idempotentRepositoryDatasource" class="com.mysql.cj.jdbc.MysqlDataSource">
        <property name="databaseName" value="default" />
        <property name="url" value="jdbc:mysql://localhost:3306" />
        <property name="user" value="root" />
        <property name="password" value="fuse" />
    </bean>

<bean id="messageIdRepository" class="org.apache.camel.processor.idempotent.jdbc.JdbcMessageIdRepository">
        <constructor-arg ref="idempotentRepositoryDatasource" />
        <constructor-arg value="fileProcessor" />
        <property name="tableExistsString" value="SELECT 1 FROM DEFAULT.CUSTOMIZED_MESSAGE_REPOSITORY WHERE 1 = 0" />
        <property name="createString" value="CREATE TABLE DEFAULT.CUSTOMIZED_MESSAGE_REPOSITORY (processorName VARCHAR(255), messageId VARCHAR(100), createdAt TIMESTAMP)" />
        <property name="queryString" value="SELECT COUNT(*) FROM DEFAULT.CUSTOMIZED_MESSAGE_REPOSITORY WHERE processorName = ? AND messageId = ?" />
        <property name="insertString" value="INSERT INTO DEFAULT.CUSTOMIZED_MESSAGE_REPOSITORY (processorName, messageId, createdAt) VALUES (?, ?, ?)" />
        <property name="deleteString" value="DELETE FROM DEFAULT.CUSTOMIZED_MESSAGE_REPOSITORY WHERE processorName = ? AND messageId = ?" />
    </bean>
...