Although the third-person camera can move through certain transparent blocks like glass, tall grass, or iron bars, it acts as if the most transparent block of them all, the barrier, is a fully opaque block that the player cannot see through.
To reproduce
Build a wall of barriers
Stand in front of it
Enable third-person camera (F5)
→ ❌ Notice that the camera is placed just on the wall and cannot move behind it
Can confirm.