Getting knocked off the roof into this point will mean a player is completely stuck.
I am playing Horn of Magnus.
From Start of level;
Prceed to climb into the guard tower, drop down from the guard tower where the first tome is located into a courtyard with a fire pit. Take the left hand options and go across the roofs above the pig pens/barn and I’m on top of the slate roof that rises to the right.
I have not played the Beta so it might have been fixed as part of those bug fixes.
Can recreate every time you drop off into the little area.