I went on a taming spree to check, taming every instance of the "Sparkly Brown Dustmoth w/ Orange Glow" colors until they didn't spawn in that color anymore. In total, I tamed;
- 17 Crystalline Dustmoth
- 2
of this version of Underlight Flickerwing
- 7
of this version of the Underlight Flickerwing.
Not a single one had sparkles. The wowhead model viewer shows they should have sparkle, but they definitely don't on live. I also checked
Rockhusk Flickerwing just in case the models got swapped, but no sparkles either. It seems that the sparkle has been lost on that specific moth color. That, or the sparkle ingame is so incredibly hard to see that it's just really easy to miss.
Wouldn't be the first time a texture has been messed up on a Dragonflight mob though (cough cough that one lava spider that's almost pitch black due to missing textures).

My Flight Rising lair
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Times banned from World of Warcraft: 1
Reason for ban: Reporting an item duplication exploit with Pet Battles I accidentally found during Mists of Pandaria. 3 week duration.