Letting anonymous user to see fields?
If there is no field permission module installed, all fields are always visible. So if you don't want to restrict any fields, then disable the content permissions module.

Once such a module is installed, it works as implemented by that module. And there is no way for such a module to guess the permissions you want (should it be visible to auth users only, or anon users too.. maybe only a specific role?), so it can only chose the safe way and does not grant anything automatically.

That is consistent with all other permissions, when you install a new module.