Particles "iconcrack_", "blockcrack_" and "blockdust_" not working: Unknown effect name

Testing some particles, i tried to make those work, and they dont work.

How to reproduce:
-Do /particle blockdust_ ~ ~ ~ 1 1 1 1
-Test with blockcrack_ and iconcrack_ replacing the blockdust_ in the command
-Watch how you get "Usage: Unknown effect name (iconcrack_)"