Steps to see the bug:

• Create new process
• Go to source tab
• add following xml to process:

<mail name="send mail">
<to addresses="${registrant}" />
<subject>Important</subject>
<text><![CDATA[
Hi ${name},
This is an important mail]]>
</text>
<transition to="end" />
</mail>

• Save
• Go to diagram tab, a new activity 'send mail' has been created
• Move the node visually to somewhere else
• Save
• go back to the source tab
• The to, subject, text and transition are now gone:

<mail name="send mail" g="240,226,80,40">
</mail>