What can make particles not appear when playing & emitting are true?

I have a projectile script that I use to activate, move, and deactivate projectiles. A projectile is an instantiation of a prefab that contains 2 particle systems and a point light

-OnEnable makes sure the particle systems are turned on. Update moves the projectile and destroys it when conditions are met. Nothing complicated. It has been working perfectly for all four projectiles. I don’t know what I hit/changed, but now one projectile is not working. The other 3 are perfect. On the one that is acting up, only one particle system is visible. I have confirmed, with a breakpoint and watch, that both particle systems are playing and emitting, but only one is visible. The other is consistently not showing up. It is correctly placed on the missile (i.e., not accidentally moved offscreen), but simply not doing anything. Any idea as to what I might have touched here? (pre-warm is on)

The parent object and both emitters are set to 1. I’ve tried scaling both emitters separately (up to 50), and the parent as well. The one emitter that works scales, but my invisible one is still invisible.