In areas such as the frozen wastelands + all the tunnels inside, There is no ranger or druid bonuses.

They seem albeit barren, but they are still 'wilderness'.

Is this intentional, or something that needs attention?

This seems more like a suggestion to me. Thread moved.

I can't speak for these areas, but stuff like this is often a matter of variables not being set correctly when areas are built.

I agree! They should still count as wilderness