Issue with CF "SeeCustomField" Right - Doesn't work?

I would like to have custom fields that are read only. I figured that the “SeeCustomField” right would allow for a user to see a custom field without being able to modify it, however the right appears to do nothing.

If I have a Queue called General with users having the “SeeCustomField” right, but not the “ModifyCustomField” right, the custom fields disappear! The only way I can get these custom fields visible is to grant the “ModifyCustomField.” What is the purpose of “SeeCustomField” if “ModifyCustomField” controls both viewing AND modifying a CF?

I have also experimented with modifying the CF rights to grant/revoke the “SeeCustomField” and “ModifyCustomField” rights. The outcome is the same.

I am using RT 4.2.9