Calling setRequired() on a RadioButton or CheckBox in SD portal doesn't remove (optional) text from UI

Behaviours mapped to the "Use Service Desk mapping" type on a RadioButton or CheckBox custom field still displays "optional" in the customer portal whenever calling setRequired(true) on those fields

Steps to reproduce:

1. Create a SD project
2. Create a RadioButton or CheckBox custom field
3. Add the field to the customer portal screen
4. Create a Behaviour with the "Use Service Desk mapping" and mapped to "All request types"
5. In the initialiser paste this code

   getFieldByName(FIELD_NAME).setRequired(true)

1. Go to the customer portal in the created SD project and notice the "(optional)" text on the field which shouldn't be there as the field is set to required