Sub emitters: Start Delay & Burst Cycles do not work

I have a particle projectile which uses collision, on collision this particle dies, and triggers 4 sub emitters for a hit effect. However the effects on the sub emitters do not work as they should

• One of the sub emitters has a start delay of 0.25 - there is no delay, it just plays immediately.

• Another sub emitter plays a quick sprite sheet animation, but it only plays once - instead of three times. It's a burst with: count: 1 cycles: 3 interval: 0.25 probability: 1