This is likely given it's underground, and in the same sort of style as Shrine of Amana (which also doesn't seem to be there). Not to mention the implication it's not even in Drangliec in the first place.
Next time I play I want to take a closer look at the backgrounds of Huntman's Copse to see if a crossover with Shadow Woods can be noticed in any way...
It could also be the Shaded Ruins, especially if the Copse is on some sort of elevation and the Shaded Woods are down below or something.
ah, ok, maybe like this then: