When switching cabs of the BR 110 in the Stuck in the Middle with Hude scenario there are two red signals which aspects are shown as green. The scenario doesn't fail when driving past them but the emergency brakes are deployed by PZB if enabled. The signals never turn green leaving the player no choice but to drive past them.
The signals are indeed broken. However some show red with two white diagonal lights which means shunting is permitted. But how do I pass the signal without the breakes coming on. And when I'm on my way back to the wagons the scenario fails me because I ran through a red light.
Use the PZB override (on PC, Del key) to override the PZB magnet. From what I see those signals should be Red with Sh1 (two diagonal white lights) that means shunting permitted, it's weird signalling but it should work.