'normal' particles don't work

When I try to create particles using /particle, it won't create the 'normal' particles, however it shows success. It works when I use the 'force'-ed particles.

I use for example the command: /particle slime ~ ~ ~ 3 3 3 10 100 normal
Or: /particle dragonbreath ~ ~ ~ 0 0 0 10 3 normal

The above doesn't work, but these do:
/particle slime ~ ~ ~ 3 3 3 10 100 force
/particle dragonbreath ~ ~ ~ 0 0 0 10 3 force