The door between the Mongrelwoods and the canal is currently broken. You can click on it, it has an "open" on the radial menu, but it does not open. You can still pass through from the canal to the mongrelwoods.
This should be fixed. Seems like a patch issue with pathing and the door being inaccessible. I've moved it out slightly so you can get close enough to open it. I suspect other doors will have similar issues, so please report them.
Still no, I cannot open it, sorry.
Haven't uploaded the change yet. Patience!