Hello,
User who have "can contribute" role in an application can't see the fields ! They can only see the master dimension.
But they can see the fields when New Authoring Experience is disabled.
It's very complicated to explain to new user that fields are available on one side and disable on the other side.
It forces to add all the fields in master items.
Why the field tab is disabled for contributor ? Field should be available but the capability to reload the application should be disabled.