p. 34, Movement Cost Table (also applies to the same table in the tables appendix, p. 199)
Woods - Prohibited Movement Type/Unit Type
It lists "g, n, r, s, v, w movement types4"
I don't think "r" is a unit movement code (see p. 35, Unit Movement Type Table. No "r" is listed.)
I think this was intended to be an "h," for hover. (See p. 35, under Hover Movement, "Hover units typically cannot enter woods features")
If I am correct, then the fix would be to change the table entry on p. 34 to "g, n, h, s, v, w movement types4"