CaseComment not retrieved with metadata backup

[alan-morey]

CaseComment CustomObject and CaseComment Workflow metadata are not retrieved as part of the metadata backup.

However, if I use Force Migration Tool to retrieve the below package.xmlthen the metadata components are downloaded.

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
  <types>
    <members>CaseComment</members>
    <name>CustomObject</name>
  </types>

  <types>
    <members>CaseComment</members>
    <name>Workflow</name>
  </types>

  <version>37.0</version>
</Package>