Map/location specific tearing

Has anyone noticed that when half way through playing the levels Assault on the Control Room and Two Betrayals, when playing in anniversary graphics there is a slight horizontal tearing like effect in the middle of the screen that occurs when walking through the short cave just after you come down the spiraling path that leads off of the side of the cliff and kill the two hunters (AOTCR) or walking through the cave just before the spiraling pathway on Two Betrayals.

Not sure what it is but it’s been there since day one and always happens in that cave.