"I usually have my shading rate set to .01 for a final render"

That's an incredibly low MSR ( lower value being higher quality)

I've never gone below 0.1, which some would say is too low (high quality), Bagginsbill feels that 0.2 is sufficient for the most detailed displacement and shader effect details. You may be unnecessarily taxing your render times by using such a low value as 0.01. Just giving a heads up on that.

Also if you're rendering at that MSR value for the sparkle shader try setting it actor/render value 0.2 and see if it renders out properly.