JS ClipSlot get("will_record_on_start") not working when clip exists

Hi everyone,

I currently dig more deep into Max and the Live API. For my current patch I switched to JavaScript for handling Live API communication and observing/getting properties. Currently I'm stuck on ClipSlot property "will_record_on_start". I observe a Tracks fired_slot_index property and has_clip property for the first two ClipSlots of it. In the callback for the Track observer I call get("will_record_on_start") for the fired ClipSlot.

This works fine for ClipSlots which do not have a Clip yet but as soon as a Clip exists I get:

jsliveapi: get: no property called 'will_record_on_start'

According to the LOM I do not see why it behaves different depending on if there is a Clip or not.
Here is the simplified JavaScript to reproduce:

autowatch = 1;

var track_fired_slot_index;
var clip_slot = new Array();

function set_up(track) {

    track_fired_slot_index = new LiveAPI(this.patcher, track_observer_callback, "live_set", "tracks", track);
    if (!track_fired_slot_index)
    {
        post("no api object","n");
    }

    track_fired_slot_index.property = "fired_slot_index";

    for (slot = 0; slot < 2; slot++)
    {
        clip_slot[slot] = new LiveAPI(this.patcher, "live_set", "tracks", track, "clip_slots", slot);
        if (!clip_slot[slot])
        {
            post("no api object","n");
        }

        clip_slot[slot].track = track;
        clip_slot[slot].slot = slot;
        clip_slot[slot].property = "has_clip";
    }

}

function track_observer_callback(args) {
    post("track_observer_callback called with arguments:", args, "n");

    switch (args[0])
    {
        case "id":

            //
            break;

        case "fired_slot_index":

            fired_slot_index = track_fired_slot_index.get("fired_slot_index");
            if((fired_slot_index > -1) && (fired_slot_index < 2))
            {
                post("track_observer_callback will_record_on_start:", clip_slot[fired_slot_index].get("will_record_on_start"), "n");
            }

            break;
    }
}

function bang() {
    set_up(0);
}

I'm using the latest Version of both, Max and Live. Any idea why it behaves different?