What would cause the 'dump' output in a template to not show the expand/collapse buttons?

I'm using dump in a modal template to show the contents of an array on screen. With XF 2.2 & below it's always worked fine, with XF 2.3.4 though I'm running into the situation where more-often-than-not the expand/collapse buttons aren't showing on the screen.

Here's a random example where within the same template dump is showing the buttons in one spot but not another to give an idea of what I'm describing.



When viewing the code, the link sf-dump-ref...

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