A few ideas, going from easiest to most unfortunate.
1. Try going onto the ritual platforms from any of the areas where the railing is broken on the sides instead of going up the stairs.
2. Try using Tactical Camera
3. If you're stuck and but can change characters, swap characters and try making a new save, and then loading that save.
4. Try standing there for more than 2 minutes, then see if player control is given back to you.
5. Reinstall the game (Maybe something with the platforms just didn't install correctly?)