This only affects the display within the RE - submitting the edit doesn't change the type(s).
Steps to reproduce:
1. Open RE for an existing release
2. Navigate away from the first tab
3. Navigate back to the first tab and the Type and Extra Type values will have disappeared
Additionally, the Extra Type field will be an editable field (i.e. its lost its disabled state).
MBS-2199hides these fields entirely, so I am closing this with it.