Scripts attached to camera not executing in Timeline playback

I have two virtual cameras, one that does a drone flight across a terrain on a dolly track, and another that simply circles around an object. I built a timeline that successfully transitions from one to the other but the script that rotates the camera is not executing when performing playback from the Timeline window. If I play my full project though, the script runs as expected.

Here’s the Timeline

And here’s the virtual camera w/ the script attached that’s not executing

Is this the intended behavior?

Yes, that is expected. Timeline preview mode does not enter play mode.