Can't dye horse armor within mythicmob's item creation

Summary

used mythicmob to create different colors of leather horse armor to boost horse's armor and movement. but the horse armor can't seems to be dyed

Steps to reproduce

• go into plugin folder, nav yourself into item folder
• create a horse item
• try to color it with code using your fingers
• let the disappointment sink in

Current behavior

dyed color horse armor returns as a regular leather horse armor in game

Intended correct behavior

dyed color horse armor should return as a specified dyed color

Server log file

no error within log files

Proposed fixes

Not quite sure what the issue is.