Switching from design to source tab does not save last changes in marshal EIP

I have the following route

  <route id="myRoute">
        <from uri="timer:foo?period=5000"/>
        <marshal>
            <jaxb contextPath="com.foo"/>
        </marshal>
        <log message="blah"/>
    </route>

To reproduce this issue you have to do as follows
1. Create a new route in design mode
from -> marshal -> log
2. select jaxb as the data format for marhsal
3. enter com.foo as the package
4. click source tab

The XML is correct.

5. click design tab
6. mark [x] in pretty print option in jaxb data format for marshal
7. click source tab

The XML has not been updated, and there is no pretty print option in <jaxb>