Falling through the floor in Salit Camp, Zalit's Yurt
Steps to reproduce: find a Salit Camp.
Step into Zalit's Yurt.
The Player will stuck in the textures, stepping back will cause him to fall.
By the way, in original Morrowind, if you fall through the textures, the game will automatically reset your position after some time of free falling. OpenMW does not, the fall is infinite, from what I saw.