Unsure if this is a technical issue or I'm missing something vital in the gameplay.
I've opened the prison cell with the wheel, opened the secret tunnel and headed to dead end.
I can turn on the light globe which is done, but when I turn around there are no more light globes to light.
If I then try to turn around either left or right, I get instantly ported to outside the prison cell with the tunnel not open anymore.
Checked a few walkthroughs and none of them mention this, ie
"The jail is now empty and the only thing you can see is a grating in the floor. Does it open and is there anything inside? If all goes well a false wall should open. Follow the tunnel - it gets very dark but keep on going. At the end is an opening looking out over the sea. There must be some way to light things up a bit. On the left is a light bulb. Give it a tap. Go back up the tunnel turning on all 6 lights. Now go back down the tunnel and open the hidden door"