[Fixed via v17.1.2] Expressions don't accept Marker Names anymore

In the past, Markers could be accessed simply by their name. This stopped working in the Beta unfortunately.

This previously worked:

var sTime = marker.key("Start").time;

Now I have to call the Marker by it's index:

var sTime = marker.key(1).time;

Is this a temporary Beta hiccup, or is this actually a new bahaviour?

Thanks.
 
System info
    Application: After Effects (Beta) v17.1.2.2
    OS: Windows v10.0.18363, RAM: 31.95 GB, CPUs (logical): 12