I get the message saying 'This area is deserted', which suggests that perhaps the module creators didn't meant for it to be accessible.
However, I also get an error saying 'no transition found in area', the door opens like normal, you just can't pass, and people mention you can in fact go there and possibly find Maganus's house and information about him.
So is the area meant to be inaccessible or is this an error preventing me from progressing in the module?
Edit: Seems I can't enter the Swaying Bough in Elventree any more, either. I just can't enter it — the cursor changes, I can click then, just like the usual when going through a door, but nothing happens. No error, no crash, no nothing.