HtmlPopupRenderer does not render facet's direct child

HtmlPopupRenderer does not render facet's direct child.

Example 1 (facet has a single child with no grandchildren):
<jsft:popup>
<jsfh:outputText value="popup"/>
<jsfc:facet name="popup">
<jsfh:outputText value="test"/>
</jsfc:facet>
</jsft:popup>
The popup is rendered with no content.

Example 2:
<jsft:popup>
<jsfh:outputText value="popup"/>
<jsfc:facet name="popup">
<jsft:htmlTag value="span">
<jsfh:outputText value="test"/>
</jsft:htmlTag>
</jsfc:facet>
</jsft:popup>
The text "test" is rendered directly in the popup' div element. The span element is missing.