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How to use an iterator to set the 'Template Extent' for the CREATE FISHNET tool?

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I have a base "fishnet" polygon grid. I attempted to create a model that iterates over each cell in that base fishnet grid and subdivide that cell with the Create Fishnet tool into a new feature class.

I expected that I simply would need to set the output from my iterate feature iterator as the 'Template Extent' parameter for the Create Fishnet tool. However, while I can see the name of this iterator output model variable in the drop-down list for the 'Template Extent' parameter; the name does not have the blue Model Variable icon. And more importantly, the template extent does not update at each model iteration.
Is there a way that I can make my model recognize aan iteration output as a template extent? ( see screenshot below)

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