Since incinerate has received some attention with this PTR patch, I figured it’d be good to report this bug again:
I’m not sure why this happens, but I’ve frequently seen the incinerate ability do 0 damage while attacking, even ignoring the unit’s basic attack damage. Someone said that this happens while moving after your attack projectile launches, but I have not been available to verify this. This has been the case for years now, and is pretty important to fix, as it even affects melee, as seen here: https://www.youtube.com/watch?v=Zo3T4ed-qZE . Thanks!
edited to clarify what “moving and attacking” means