In CascadeToNiagaraConverter.py
# copy the emitter enabled state. enabled = ue_fx_utils.get_lod_level_is_enabled(cascade_emitter_lod) niagara_emitter_context.set_enabled(enabled)
It stores the state well, but it seems to be a variable that is not actually being used.
1. Enable 'Cascade To Niagara Converter' Plugin
2. Make one Particle System.
3. After adding several emitters, disable only one.
4. Right-click on the Particle System and click 'Convert To Niagara Sysgem'
5. Check the emitter status in the converted Niagara System
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-130683 in the post.