Major Use a content with definition :
<cms:metadata-ref name="title"/>
<cms:metadata-ref name="description"/>
<cms:metadata-ref name="link-repeater">
<cms:metadata-ref name="title" />
<cms:metadata-ref name="link" />
</cms:metadata-ref>
The GetCommonMetadataAction for this content type with option includeRepeaterMetadata to false should return title and description.
However it just return description because title is used in the "link-repeater" data ... this is the issue.
