Dragonflies in Bitter Coast Sounds official plugin only play animation once.
These little guys in the screenshot only do their "flying around" animation once upon loading a game or changing cells, after which they just hover in place. In vanilla game this animation loops as expected.
They're called "a_photodragons" in the console and their mesh file is "Meshes/f/Photodragons.NIF", in case that helps.
Edited by Ghost User