Niagara Spawn Burst Instantaneous is doesn't work.

I wanted an option to instantly spawn a specified number of emitters, but this option doesn’t seems work at all.
I checked the particle rendered using Spawn Per Unit and Spawn Rate.
After replacing these with Spawn Burst Instantaneous, nothing is drawn.
Setting the spawn count to 10000 doesn’t increase the load so it seems like nothing is being spawned.
What could be wrong?