Maya 2018.3, "Current Time Marker" not moving during playback.


In Maya 2018.3, in the Modern Graph Editor the new-ish yellow “Current Time Marker” is not moving during playback.
Is this normal? Or is it by design? It was moving in Maya 2017 in Modern mode.
If I switch to Classic Graph Editor it’s moving during playback. Is this a bug or is it part of some kind of playback optimization? Is there an option to enable the old behavior?
The same yellow “Current Time Marker” is moving in the new Time Editor during playback.