HeadingPanel is not added to XInfoPanel when setting useHeadingPanel=yes

I am trying to modify a pre-existing installer to make use of the HeadingPanel feature using the following in my install.xml:

<modifier key="useHeadingPanel" value="yes"/>
<modifier key="headingImageOnLeft" value="yes"/>
<modifier key="headingLineCount" value="1"/>
<modifier key="headingFontSize" value="1.5"/>
<modifier key="headingBackgroundColor" value="0x00ffffff"/>
<modifier key="headingForegroundColor" value="0x00ffffff"/>
<modifier key="headingPanelCounter" value="progressbar"/>
<modifier key="headingPanelCounterPos" value="inNavigationPanel"/>

All panels display the Heading.image correctly with the exception of the XInfoPanel. For this panel the HeadingPanel is missing and XInfoPanel textArea fills the entire panel. I noted that the InfoPanel does show the HeadingPanel as expected however I already use an InfoPanel elsewhere in the installer so cannot switch to this panel type.