Spawn By Travel Distance

[TeaspoonVFX]

I've been away from the box for a bit so please forgive my ignorance....

In TyFlow v1.017 in Max 2024, I'm trying to just emit a trail of particles from particles.  Its the simplest of simple, but it not behaving as I would expect.   The spawned particles do not continue to emit as the original particles travel.

Here is an image of the flow
   

And the settings
   

And the result -- the blue particles immediately stop emitting pink particles
   

I know I'm missing something really easy.  I just don't know what it is.