[SOLVED] Entering subprocess marks process as changed for saving

Double-clicking on the subprocess in this process causes an asterisk to appear after the process  path in the title bar, and also causes RM to prompt for saving changes on closing the process.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.000">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.3.000" expanded="true" name="Process">
    <process expanded="true" height="672" width="980">
      <operator activated="true" class="subprocess" compatibility="5.3.000" expanded="true" height="60" name="Subprocess" width="90" x="112" y="75">
        <process expanded="true">
          <portSpacing port="source_in 1" spacing="0"/>
          <portSpacing port="sink_out 1" spacing="0"/>
        </process>
      </operator>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
    </process>
  </operator>
</process>