camel-jdbc transaction does not work as expected

Issue

Transaction timeout does not work as expected with following camel route, and insert queries are committed to Postgres DB.

<bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="TxManager">
  <property name="dataSource" ref="postgresqlDatasource" />
  <property name="defaultTimeout" value="4" />
</bean>
<bean class="org.apache.camel.spring.spi.SpringTransactionPolicy" id="PROPAGATION_REQUIRED">
  <property name="transactionManager" ref="TxManager" />
  <property name="propagationBehaviorName" value="PROPAGATION_REQUIRED" />
</bean>
<camelContext allowUseOriginalMessage="false" id="reproducer" xmlns="http://camel.apache.org/schema/blueprint">
  <route id="testCommit" trace="false">
    <from id="_from1" uri="timer:t1?repeatCount=1" />
    <transacted id="_transacted1" ref="PROPAGATION_REQUIRED" />
    <transform>
      <simple> INSERT INTO TESTCOMMIT(key) VALUES('1'); </simple>
    </transform>
    <to id="_to1" uri="jdbc:postgresqlDatasource?resetAutoCommit=false&amp;transacted=true" />
    <to id="_to1" uri="exec:sleep?args=60" />
    <transform>
      <simple> INSERT INTO TESTCOMMIT(key) VALUES('2'); </simple>
    </transform>
   <to id="_to2" uri="jdbc:postgresqlDatasource?resetAutoCommit=false&amp;transacted=true" />
  </route>
</camelContext>