layer height limit for non-standard nozzle sizes in Cura 15.06.03 seems wrong

[aviphysics 9]

I am using an UMO with a 0.5 mm nozzle and trying to slice with the Cura 15.06.03.

I created a custom JSON file with the nozzle size set to 0.5 mm

 

"machine_nozzle_size": { "default": 0.5 },

 

The problem is that Cura still highlights "Layer Height" in orange when I try to set it above 0.3 mm.

Is this the intended behavior? Did I miss a step? Is there a work around?