Mantled into the terrain

Yutzi

Description
South of Lionhold where the "Sunstriped Otters" are you can mantle into the terrain.

Bug Reproduction Steps
When standing near the waterfall, the terrain that goes up a bit there is an Otter. When on the waterfall side of the terrain try mantling on to the rock the Otter is on. When facing north west at the rock mantle the rock.

Expected Result
Either getting on top of the rock or not able to mantle up.
Bug Report - Actual Result
I clip into the terrain and have to use the unstuck command.