edit: I wish I had a screenshot of the second phase of the last boss where the entire floating ring you teleport to was invisible and it looked like I was walking on air.
It's not just you, my girlfriend has been running into the same issue as well. And me. for that matter. She's running a high-end nVidia machine, I'm running a mid-tier AMD rig.
I had this in vSO as well, where in looking forwards toward the bridge would cause it to disappear, but at camera angles away from the bridge it would reappear (being on the bridge it was gone permanently). When I adjusted the view distance higher, the bridge reappeared and the issue didn't occur again.