I can't see the particle effect rendered

Hi all…
I’ve been experiencing some problems with the particle effects
I fake a laser beam effect by spawning lots of GPU sprites and I add a GPU particle scene depth collision to analog an actual laser reflection

However, I found that(in both editor preview window and game), when the emitter is not in the field of view (FOV), I can’t see the particle.
When the hitting point of the “beam” is not in the FOV, I can’t see the reflection.
What’s more, as long as the emitter or the reflection point is blocked by something, the incident beam or the reflected beam won’t be shown either
Does anyone know how to fix this?
Thanks