I always found it odd that during air engagements the Wasp projectiles would always just vanish when impacting a target, especially compared to other asf like the Corona which has a very bright explosion on impact.
After playing around in sandbox to see if this was a bug I noticed the wasp's weapon does indeed have an effect made but it only triggers on grounded units. I went and checked the code and the lua seems to be missing FxImpactAirUnit.
I think enabling this weapon effects to play against air units would make it visually more interesting and look less unfinished, especially since it seems to be unintentional.
I made a few short videos as well showcasing the wasp with its effects working on air units. https://imgur.com/a/Qdp9jsf