Enemy is stuck on object and cannot attack nor can it be attacked by companions

What platform are you playing on? PC - Steam

What is happening? (and what do you expect to happen instead?)  While in the Ossuary - Lower Inner Cells and fighting enemies in the screenshotted area, if an enemy manages to get onto this specific object, it is unable to attack me or my companions and my companions are unable to attack it.  My characer is able to attack it still.  Expected result is for the enemy to be able to attack my character whether or not if they are on this object.

Does this happen in a specific area of the game?  The Ossuary - Lower Inner Cells  at the location of my screenshot.