Can't plot image into WDT waveform graph

I'm trying to plot an icon onto a WDT waveform graph but it doesn't seem to be working. The image plots while using the default (array of doubles) data type, but goes missing when I change to WDT. As far as I can tell, the two graphs are the same except for their data type.
Am I missing a step or is this a LabVIEW bug?
Attachments:
WDT problem.vi ‏26 KB

I was able obtain the icon on the WDT waveform graph in your code by changing the property selected on its property node to PlotImages.Middle.

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