particle inserted continiously

I tried to use the insert/steam or insert/pack command to make the particle inject into the reactor by a certain velocity continuously, so I write these commands in the in.XXX file:

#insert-stream version
fix ins1 nve_group insert/stream seed 524 distributiontemplate pdd1 maxattempt 100 nparticles 1000000 particlerate 400 overlapcheck yes all_in yes vel constant 0.0 0.0 0.182 insertion_face infacetop extrude_length 0.006
#insert-pack version
#fix ins1 nve_group insert/pack seed 1001 distributiontemplate pdd1 vel constant 0. 0. 0.182 insert_every 1 overlapcheck yes all_in yes particles_in_region 40 region bc1

run 1

When I simulate it only in liggghts, the particle can be injected continiously.
But when I use these comand during the cfdemcoupling, it doesn't work. Particles are only inserted once.

I don't kown how to fix it.
Thanks
Zhao