No events when streaming without manifest

[snobu]

Looks like it won't fire events if the content isn't served by the Media Services streaming endpoint.
I'm using AMP v2.1.0 (https://amp.azure.net/libs/amp/2.1.0/azuremediaplayer.min.js)

e.g. This produces nothing:

myPlayer.src([
    {
        src: "//ams1stor.blob.core.windows.net/asset-86509aa2-af36-4933-908b-3a61f5040573/Thievery%20Corporation%20-%20Forgotten_640x360_900.mp4",
        type: "video/mp4"
    },
]);

Network tab:

Streaming from Media Services with a manifest (same manifest URL example.html uses):

Is this by design or a bug?